Implement cross-origin attributes using access check interceptors.

third_party/WebKit/Source/bindings/core/v8/V8DOMWrapper.h

 /*
  * Copyright (C) 2009 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 55 matching lines @@
       v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN;
   static v8::Local<v8::Object> associateObjectWithWrapper(
       v8::Isolate*,
       Node*,
       const WrapperTypeInfo*,
       v8::Local<v8::Object> wrapper) WARN_UNUSED_RETURN;
   static void setNativeInfo(v8::Isolate*,
                             v8::Local<v8::Object>,
                             const WrapperTypeInfo*,
                             ScriptWrappable*);
+  static void clearNativeInfo(v8::Isolate*, v8::Local<v8::Object>);
   // hasInternalFieldsSet only checks if the value has the internal fields for
   // wrapper obejct and type, and does not check if it's valid or not.  The
   // value may not be a Blink's wrapper object.  In order to make sure of it,
   // Use isWrapper function instead.
   CORE_EXPORT static bool hasInternalFieldsSet(v8::Local<v8::Value>);
 };
 
 inline void V8DOMWrapper::setNativeInfo(v8::Isolate* isolate,
                                         v8::Local<v8::Object> wrapper,
                                         const WrapperTypeInfo* wrapperTypeInfo,
@@ skipping 103 matching lines @@
 
   bool m_didEnterContext;
   v8::Local<v8::Context> m_context;
   v8::TryCatch m_tryCatch;
   bool m_convertExceptions;
 };
 
 }  // namespace blink
 
 #endif  // V8DOMWrapper_h