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diff --git a/Source/JavaScriptCore/API/JSManagedValue.h b/Source/JavaScriptCore/API/JSManagedValue.h
deleted file mode 100644
index d13733d08..000000000
--- a/Source/JavaScriptCore/API/JSManagedValue.h
+++ /dev/null
@@ -1,83 +0,0 @@
-/*
- * Copyright (C) 2013 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. AND ITS CONTRIBUTORS ``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 ITS 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 JSManagedValue_h
-#define JSManagedValue_h
-
-#import <JavaScriptCore/JSBase.h>
-#import <JavaScriptCore/WebKitAvailability.h>
-
-#if JSC_OBJC_API_ENABLED
-
-@class JSValue;
-@class JSContext;
-
-/*!
-@interface
-@discussion JSManagedValue represents a "conditionally retained" JSValue. 
- "Conditionally retained" means that as long as the JSManagedValue's 
- JSValue is reachable through the JavaScript object graph,
- or through the Objective-C object graph reported to the JSVirtualMachine using
- addManagedReference:withOwner:, the corresponding JSValue will 
- be retained. However, if neither graph reaches the JSManagedValue, the 
- corresponding JSValue will be released and set to nil.
-
-The primary use for a JSManagedValue is to store a JSValue in an Objective-C
-or Swift object that is exported to JavaScript. It is incorrect to store a JSValue
-in an object that is exported to JavaScript, since doing so creates a retain cycle.
-*/ 
-NS_CLASS_AVAILABLE(10_9, 7_0)
-@interface JSManagedValue : NSObject
-
-/*!
-@method
-@abstract Create a JSManagedValue from a JSValue.
-@param value
-@result The new JSManagedValue.
-*/
-+ (JSManagedValue *)managedValueWithValue:(JSValue *)value;
-+ (JSManagedValue *)managedValueWithValue:(JSValue *)value andOwner:(id)owner NS_AVAILABLE(10_10, 8_0);
-
-/*!
-@method
-@abstract Create a JSManagedValue.
-@param value
-@result The new JSManagedValue.
-*/
-- (instancetype)initWithValue:(JSValue *)value;
-
-/*!
-@property
-@abstract Get the JSValue from the JSManagedValue.
-@result The corresponding JSValue for this JSManagedValue or 
- nil if the JSValue has been collected.
-*/
-@property (readonly, strong) JSValue *value;
-
-@end
-
-#endif // JSC_OBJC_API_ENABLED
-
-#endif // JSManagedValue_h