binding: Changes the association among global-proxy/global/window-instance (2nd attempt).

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

 /*
  * Copyright (C) 2010 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 162 matching lines @@
 
   DomTemplateFunction dom_template_function;
   const TraceFunction trace_function;
   const TraceWrappersFunction trace_wrappers_function;
   PreparePrototypeAndInterfaceObjectFunction
       prepare_prototype_and_interface_object_function;
   const char* const interface_name;
   const WrapperTypeInfo* parent_class;
   const unsigned wrapper_type_prototype : 1;  // WrapperTypePrototype
   const unsigned wrapper_class_id : 2;        // WrapperClassId
-  const unsigned
-      active_script_wrappable_inheritance : 1;  // ActiveScriptWrappableInheritance
+  const unsigned  // ActiveScriptWrappableInheritance
+      active_script_wrappable_inheritance : 1;
   const unsigned lifetime : 1;                // Lifetime
 };
 
 template <typename T, int offset>
 inline T* GetInternalField(const v8::PersistentBase<v8::Object>& persistent) {
   DCHECK_LT(offset, v8::Object::InternalFieldCount(persistent));
   return reinterpret_cast<T*>(
       v8::Object::GetAlignedPointerFromInternalField(persistent, offset));
 }
 
 template <typename T, int offset>
 inline T* GetInternalField(v8::Local<v8::Object> wrapper) {
   DCHECK_LT(offset, wrapper->InternalFieldCount());
   return reinterpret_cast<T*>(
       wrapper->GetAlignedPointerFromInternalField(offset));
 }
 
+// The return value can be null if |wrapper| is a global proxy, which points to
+// nothing while a navigation.
 inline ScriptWrappable* ToScriptWrappable(
     const v8::PersistentBase<v8::Object>& wrapper) {
   return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper);
 }
 
 inline ScriptWrappable* ToScriptWrappable(v8::Local<v8::Object> wrapper) {
   return GetInternalField<ScriptWrappable, kV8DOMWrapperObjectIndex>(wrapper);
 }
 
 inline const WrapperTypeInfo* ToWrapperTypeInfo(
     const v8::PersistentBase<v8::Object>& wrapper) {
   return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
 }
 
 inline const WrapperTypeInfo* ToWrapperTypeInfo(v8::Local<v8::Object> wrapper) {
   return GetInternalField<WrapperTypeInfo, kV8DOMWrapperTypeIndex>(wrapper);
 }
 
 }  // namespace blink
 
 #endif  // WrapperTypeInfo_h