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diff --git a/Source/JavaScriptCore/bytecode/ObjectPropertyConditionSet.h b/Source/JavaScriptCore/bytecode/ObjectPropertyConditionSet.h
deleted file mode 100644
index 957eaac25..000000000
--- a/Source/JavaScriptCore/bytecode/ObjectPropertyConditionSet.h
+++ /dev/null
@@ -1,175 +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. 
- */
-
-#ifndef ObjectPropertyConditionSet_h
-#define ObjectPropertyConditionSet_h
-
-#include "ObjectPropertyCondition.h"
-#include <wtf/FastMalloc.h>
-#include <wtf/RefCounted.h>
-#include <wtf/Vector.h>
-
-namespace JSC {
-
-// An object property condition set is used to represent the set of additional conditions
-// that need to be met for some heap access to be valid. The set can have the following
-// interesting states:
-//
-// Empty: There are no special conditions that need to be met.
-// Invalid: The heap access is never valid.
-// Non-empty: The heap access is valid if all the ObjectPropertyConditions in the set are valid.
-
-class ObjectPropertyConditionSet {
-public:
-    ObjectPropertyConditionSet() { }
-    
-    static ObjectPropertyConditionSet invalid()
-    {
-        ObjectPropertyConditionSet result;
-        result.m_data = adoptRef(new Data());
-        return result;
-    }
-    
-    static ObjectPropertyConditionSet create(const Vector<ObjectPropertyCondition>& vector)
-    {
-        if (vector.isEmpty())
-            return ObjectPropertyConditionSet();
-        
-        ObjectPropertyConditionSet result;
-        result.m_data = adoptRef(new Data());
-        result.m_data->vector = vector;
-        return result;
-    }
-    
-    bool isValid() const
-    {
-        return !m_data || !m_data->vector.isEmpty();
-    }
-    
-    bool isEmpty() const
-    {
-        return !m_data;
-    }
-    
-    typedef const ObjectPropertyCondition* iterator;
-    
-    iterator begin() const
-    {
-        if (!m_data)
-            return nullptr;
-        return m_data->vector.begin();
-    }
-    iterator end() const
-    {
-        if (!m_data)
-            return nullptr;
-        return m_data->vector.end();
-    }
-    
-    ObjectPropertyCondition forObject(JSObject*) const;
-    ObjectPropertyCondition forConditionKind(PropertyCondition::Kind) const;
-
-    unsigned numberOfConditionsWithKind(PropertyCondition::Kind) const;
-
-    bool hasOneSlotBaseCondition() const;
-    
-    // If this is a condition set for a prototype hit, then this is guaranteed to return the
-    // condition on the prototype itself. This allows you to get the object, offset, and
-    // attributes for the prototype. This will RELEASE_ASSERT that there is exactly one Presence
-    // in the set, and it will return that presence.
-    ObjectPropertyCondition slotBaseCondition() const;
-    
-    // Attempt to create a new condition set by merging this one with the other one. This will
-    // fail if any of the conditions are incompatible with each other. When if fails, it returns
-    // invalid().
-    ObjectPropertyConditionSet mergedWith(const ObjectPropertyConditionSet& other) const;
-    
-    bool structuresEnsureValidity() const;
-    bool structuresEnsureValidityAssumingImpurePropertyWatchpoint() const;
-    
-    bool needImpurePropertyWatchpoint() const;
-    bool areStillLive() const;
-    
-    void dumpInContext(PrintStream&, DumpContext*) const;
-    void dump(PrintStream&) const;
-    
-    // Helpers for using this in a union.
-    void* releaseRawPointer()
-    {
-        return static_cast<void*>(m_data.leakRef());
-    }
-    static ObjectPropertyConditionSet adoptRawPointer(void* rawPointer)
-    {
-        ObjectPropertyConditionSet result;
-        result.m_data = adoptRef(static_cast<Data*>(rawPointer));
-        return result;
-    }
-    static ObjectPropertyConditionSet fromRawPointer(void* rawPointer)
-    {
-        ObjectPropertyConditionSet result;
-        result.m_data = static_cast<Data*>(rawPointer);
-        return result;
-    }
-
-    // FIXME: Everything below here should be private, but cannot be because of a bug in VS.
-    
-    // Internally, this represents Invalid using a pointer to a Data that has an empty vector.
-    
-    // FIXME: This could be made more compact by having it internally use a vector that just has
-    // the non-uid portion of ObjectPropertyCondition, and then requiring that the callers of all
-    // of the APIs supply the uid.
-    
-    class Data : public ThreadSafeRefCounted<Data> {
-        WTF_MAKE_NONCOPYABLE(Data);
-        WTF_MAKE_FAST_ALLOCATED;
-        
-    public:
-        Data() { }
-        
-        Vector<ObjectPropertyCondition> vector;
-    };
-    
-private:
-    RefPtr<Data> m_data;
-};
-
-ObjectPropertyConditionSet generateConditionsForPropertyMiss(
-    VM&, JSCell* owner, ExecState*, Structure* headStructure, UniquedStringImpl* uid);
-ObjectPropertyConditionSet generateConditionsForPropertySetterMiss(
-    VM&, JSCell* owner, ExecState*, Structure* headStructure, UniquedStringImpl* uid);
-ObjectPropertyConditionSet generateConditionsForPrototypePropertyHit(
-    VM&, JSCell* owner, ExecState*, Structure* headStructure, JSObject* prototype,
-    UniquedStringImpl* uid);
-ObjectPropertyConditionSet generateConditionsForPrototypePropertyHitCustom(
-    VM&, JSCell* owner, ExecState*, Structure* headStructure, JSObject* prototype,
-    UniquedStringImpl* uid);
-
-ObjectPropertyConditionSet generateConditionsForPropertySetterMissConcurrently(
-    VM&, JSGlobalObject*, Structure* headStructure, UniquedStringImpl* uid);
-
-} // namespace JSC
-
-#endif // ObjectPropertyConditionSet_h
-