binding: Reimplements V8HiddenValue as V8PrivateProperty.

third_party/WebKit/Source/bindings/core/v8/v8.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
     'includes': [
         'custom/custom.gypi',
         '../../modules/v8/generated.gypi',
     ],
     'variables': {
@@ skipping 148 matching lines @@
             'V8ObjectConstructor.h',
             'V8PagePopupControllerBinding.cpp',
             'V8PagePopupControllerBinding.h',
             'V8PerContextData.cpp',
             'V8PerContextData.h',
             'V8PerformanceObserverCallback.cpp',
             'V8PerformanceObserverCallback.h',
             'V8PerIsolateData.cpp',
             'V8PerIsolateData.h',
             'V8PersistentValueVector.h',
+            'V8PrivateProperty.cpp',
+            'V8PrivateProperty.h',
             'V8ScriptRunner.cpp',
             'V8ScriptRunner.h',
             'V8StringResource.cpp',
             'V8StringResource.h',
             'V8ThrowException.cpp',
             'V8ThrowException.h',
             'V8V0CustomElementLifecycleCallbacks.cpp',
             'V8V0CustomElementLifecycleCallbacks.h',
             'V8ValueCache.cpp',
             'V8ValueCache.h',
@@ skipping 16 matching lines @@
             'ScriptStreamerTest.cpp',
             'SerializedScriptValueTest.cpp',
             'ToV8Test.cpp',
             'V8BindingForTesting.cpp',
             'V8BindingForTesting.h',
             'V8BindingTest.cpp',
             'V8ScriptRunnerTest.cpp',
         ],
     },
 }