Simplify the way to initialize context

Source/bindings/v8/DOMWrapperWorld.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 50 matching lines @@
     static const int mainWorldExtensionGroup = 0;
     static PassRefPtr<DOMWrapperWorld> ensureIsolatedWorld(int worldId, int extensionGroup);
     ~DOMWrapperWorld();
 
     static bool isolatedWorldsExist() { return isolatedWorldCount; }
     static void getAllWorldsInMainThread(Vector<RefPtr<DOMWrapperWorld> >& worlds);
 
     static DOMWrapperWorld* world(v8::Handle<v8::Context> context)
     {
         ASSERT(contextHasCorrectPrototype(context));
-        return V8PerContextDataHolder::from(context)->world();
+        return V8PerContextData::world(context);
     }
 
     // Will return null if there is no DOMWrapperWorld for the current v8::Context
     static DOMWrapperWorld* current(v8::Isolate*);
     static DOMWrapperWorld* mainWorld();
 
     // Associates an isolated world (see above for description) with a security
     // origin. XMLHttpRequest instances used in that world will be considered
     // to come from that origin, not the frame's.
     static void setIsolatedWorldSecurityOrigin(int worldID, PassRefPtr<SecurityOrigin>);
@@ skipping 27 matching lines @@
     static bool contextHasCorrectPrototype(v8::Handle<v8::Context>);
 
     const int m_worldId;
     const int m_extensionGroup;
     OwnPtr<DOMDataStore> m_domDataStore;
 };
 
 } // namespace WebCore
 
 #endif // DOMWrapperWorld_h