remove security check from Window

Source/bindings/core/v8/WindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 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 121 matching lines @@
 }
 
 void WindowProxy::clearForNavigation()
 {
     if (!isContextInitialized())
         return;
 
     ScriptState::Scope scope(m_scriptState.get());
 
     m_document.clear();
-
-    v8::Handle<v8::Object> windowWrapper = V8Window::findInstanceInPrototypeChain(m_global.newLocal(m_isolate), m_isolate);
-    ASSERT(!windowWrapper.IsEmpty());
-    windowWrapper->TurnOnAccessCheck();
     disposeContext(DetachGlobal);
 }
 
 // Create a new environment and setup the global object.
 //
 // The global object corresponds to a DOMWindow instance. However, to
 // allow properties of the JS DOMWindow instance to be shadowed, we
 // use a shadow object as the global object and use the JS DOMWindow
 // instance as the prototype for that shadow object. The JS DOMWindow
 // instance is undetectable from JavaScript code because the __proto__
@@ skipping 331 matching lines @@
 
 void WindowProxy::updateSecurityOrigin(SecurityOrigin* origin)
 {
     ASSERT(m_world->isMainWorld());
     if (!isContextInitialized())
         return;
     setSecurityToken(origin);
 }
 
 } // namespace blink