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diff --git a/Source/JavaScriptCore/tools/FunctionOverrides.cpp b/Source/JavaScriptCore/tools/FunctionOverrides.cpp
deleted file mode 100644
index 2e328c167..000000000
--- a/Source/JavaScriptCore/tools/FunctionOverrides.cpp
+++ /dev/null
@@ -1,250 +0,0 @@
-/*
- * Copyright (C) 2015 Apple Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "FunctionOverrides.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <wtf/DataLog.h>
-#include <wtf/NeverDestroyed.h>
-#include <wtf/text/CString.h>
-#include <wtf/text/StringBuilder.h>
-#include <wtf/text/StringHash.h>
-
-namespace JSC {
-
-/*
-  The overrides file defines function bodies that we will want to override with
-  a replacement for debugging purposes. The overrides file may contain
-  'override' and 'with' clauses like these:
-
-     // Example 1: function foo1(a)
-     override !@#$%{ print("In foo1"); }!@#$%
-     with abc{
-         print("I am overridden");
-     }abc
-
-     // Example 2: function foo2(a)
-     override %%%{
-         print("foo2's body has a string with }%% in it.");
-         // Because }%% appears in the function body here, we cannot use
-         // %% or % as the delimiter. %%% is ok though.
-     }%%%
-     with %%%{
-         print("Overridden foo2");
-     }%%%
-
-  1. Comments are lines starting with //.  All comments will be ignored.
-
-  2. An 'override' clause is used to specify the original function body we
-     want to override. The with clause is used to specify the overriding
-     function body.
-
-     An 'override' clause must be followed immediately by a 'with' clause.
-
-  3. An 'override' clause must be of the form:
-         override <delimiter>{...function body...}<delimiter>
-
-     The override keyword must be at the start of the line.
-
-     <delimiter> may be any string of any ASCII characters (except for '{',
-     '}', and whitespace characters) as long as the pattern of "}<delimiter>"
-     does not appear in the function body e.g. the override clause of Example 2
-     above illustrates this.
-
-     The start and end <delimiter> must be identical.
-
-     The space between the override keyword and the start <delimiter> is
-     required.
-
-     All characters between the pair of delimiters will be considered to
-     be part of the function body string. This allows us to also work
-     with script source that are multi-lined i.e. newlines are allowed.
-     
-  4. A 'with' clause is identical in form to an 'override' clause except that
-     it uses the 'with' keyword instead of the 'override' keyword.
- */
-
-FunctionOverrides& FunctionOverrides::overrides()
-{
-    static LazyNeverDestroyed<FunctionOverrides> overrides;
-    static std::once_flag initializeListFlag;
-    std::call_once(initializeListFlag, [] {
-        const char* overridesFileName = Options::functionOverrides();
-        overrides.construct(overridesFileName);
-    });
-    return overrides;
-}
-    
-FunctionOverrides::FunctionOverrides(const char* overridesFileName)
-{
-    parseOverridesInFile(overridesFileName);
-}
-
-static void initializeOverrideInfo(const SourceCode& origCode, const String& newBody, FunctionOverrides::OverrideInfo& info)
-{
-    String origProviderStr = origCode.provider()->source().toString();
-    unsigned origBraceStart = origCode.startOffset();
-    unsigned origFunctionStart = origProviderStr.reverseFind("function", origBraceStart);
-    unsigned headerLength = origBraceStart - origFunctionStart;
-    String origHeader = origProviderStr.substring(origFunctionStart, headerLength);
-
-    String newProviderStr;
-    newProviderStr.append(origHeader);
-    newProviderStr.append(newBody);
-
-    RefPtr<SourceProvider> newProvider = StringSourceProvider::create(newProviderStr, "<overridden>");
-
-    info.firstLine = 1;
-    info.lineCount = 1; // Faking it. This doesn't really matter for now.
-    info.startColumn = 1;
-    info.endColumn = 1; // Faking it. This doesn't really matter for now.
-    info.parametersStartOffset = newProviderStr.find("(");
-    info.typeProfilingStartOffset = newProviderStr.find("{");
-    info.typeProfilingEndOffset = newProviderStr.length() - 1;
-
-    info.sourceCode =
-        SourceCode(newProvider.release(), info.typeProfilingStartOffset, info.typeProfilingEndOffset + 1, 1, 1);
-}
-    
-bool FunctionOverrides::initializeOverrideFor(const SourceCode& origCode, FunctionOverrides::OverrideInfo& result)
-{
-    ASSERT(Options::functionOverrides());
-    FunctionOverrides& overrides = FunctionOverrides::overrides();
-
-    auto it = overrides.m_entries.find(origCode.view().toString());
-    if (it == overrides.m_entries.end())
-        return false;
-
-    initializeOverrideInfo(origCode, it->value, result);
-    return true;
-}
-
-#define SYNTAX_ERROR "SYNTAX ERROR"
-#define IO_ERROR "IO ERROR"
-#define FAIL_WITH_ERROR(error, errorMessageInBrackets) \
-    do { \
-        dataLog("functionOverrides ", error, ": "); \
-        dataLog errorMessageInBrackets; \
-        exit(EXIT_FAILURE); \
-    } while (false)
-
-static bool hasDisallowedCharacters(const char* str, size_t length)
-{
-    while (length--) {
-        char c = *str++;
-        // '{' is also disallowed, but we don't need to check for it because
-        // parseClause() searches for '{' as the end of the start delimiter.
-        // As a result, the parsed delimiter string will never include '{'.
-        if (c == '}' || isASCIISpace(c))
-            return true;
-    }
-    return false;
-}
-
-static String parseClause(const char* keyword, size_t keywordLength, FILE* file, const char* line, char* buffer, size_t bufferSize)
-{
-    const char* keywordPos = strstr(line, keyword);
-    if (!keywordPos)
-        FAIL_WITH_ERROR(SYNTAX_ERROR, ("Expecting '", keyword, "' clause:\n", line, "\n"));
-    if (keywordPos != line)
-        FAIL_WITH_ERROR(SYNTAX_ERROR, ("Cannot have any characters before '", keyword, "':\n", line, "\n"));
-    if (line[keywordLength] != ' ')
-        FAIL_WITH_ERROR(SYNTAX_ERROR, ("'", keyword, "' must be followed by a ' ':\n", line, "\n"));
-
-    const char* delimiterStart = &line[keywordLength + 1];
-    const char* delimiterEnd = strstr(delimiterStart, "{");
-    if (!delimiterEnd)
-        FAIL_WITH_ERROR(SYNTAX_ERROR, ("Missing { after '", keyword, "' clause start delimiter:\n", line, "\n"));
-    
-    size_t delimiterLength = delimiterEnd - delimiterStart;
-    String delimiter(delimiterStart, delimiterLength);
-
-    if (hasDisallowedCharacters(delimiterStart, delimiterLength))
-        FAIL_WITH_ERROR(SYNTAX_ERROR, ("Delimiter '", delimiter, "' cannot have '{', '}', or whitespace:\n", line, "\n"));
-    
-    String terminatorString;
-    terminatorString.append("}");
-    terminatorString.append(delimiter);
-
-    const char* terminator = terminatorString.ascii().data();
-    line = delimiterEnd; // Start from the {.
-
-    StringBuilder builder;
-    do {
-        const char* p = strstr(line, terminator);
-        if (p) {
-            if (p[strlen(terminator)] != '\n')
-                FAIL_WITH_ERROR(SYNTAX_ERROR, ("Unexpected characters after '", keyword, "' clause end delimiter '", delimiter, "':\n", line, "\n"));
-
-            builder.append(line, p - line + 1);
-            return builder.toString();
-        }
-        builder.append(line);
-
-    } while ((line = fgets(buffer, bufferSize, file)));
-
-    FAIL_WITH_ERROR(SYNTAX_ERROR, ("'", keyword, "' clause end delimiter '", delimiter, "' not found:\n", builder.toString(), "\n", "Are you missing a '}' before the delimiter?\n"));
-}
-
-void FunctionOverrides::parseOverridesInFile(const char* fileName)
-{
-    if (!fileName)
-        return;
-    
-    FILE* file = fopen(fileName, "r");
-    if (!file)
-        FAIL_WITH_ERROR(IO_ERROR, ("Failed to open file ", fileName, ". Did you add the file-read-data entitlement to WebProcess.sb?\n"));
-
-    char* line;
-    char buffer[BUFSIZ];
-    while ((line = fgets(buffer, sizeof(buffer), file))) {
-        if (strstr(line, "//") == line)
-            continue;
-
-        if (line[0] == '\n' || line[0] == '\0')
-            continue;
-
-        size_t keywordLength;
-        
-        keywordLength = sizeof("override") - 1;
-        String keyStr = parseClause("override", keywordLength, file, line, buffer, sizeof(buffer));
-
-        line = fgets(buffer, sizeof(buffer), file);
-
-        keywordLength = sizeof("with") - 1;
-        String valueStr = parseClause("with", keywordLength, file, line, buffer, sizeof(buffer));
-
-        m_entries.add(keyStr, valueStr);
-    }
-    
-    int result = fclose(file);
-    if (result)
-        dataLogF("Failed to close file %s: %s\n", fileName, strerror(errno));
-}
-    
-} // namespace JSC
-