v8binding: Initializes WindowProxy iff it's uninitialized.

third_party/WebKit/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 122 matching lines @@
 // has a security token which is the domain. The outer window cannot
 // have its own properties. window.foo = 'x' is delegated to the
 // inner window.
 //
 // When a frame navigates to a new page, the inner window is cut off
 // the outer window, and the outer window identify is preserved for
 // the frame. However, a new inner window is created for the new page.
 // If there are JS code holds a closure to the old inner window,
 // it won't be able to reach the outer window via its global object.
 void WindowProxy::initializeIfNeeded() {
-  // TODO(haraken): It is wrong to re-initialize an already detached window
-  // proxy. This must be 'if(m_lifecycle == Lifecycle::ContextUninitialized)'.
-  if (m_lifecycle != Lifecycle::ContextInitialized) {
+  if (m_lifecycle == Lifecycle::ContextUninitialized ||
+      m_lifecycle == Lifecycle::GlobalObjectDetached) {
     initialize();
   }
 }
 
 v8::Local<v8::Object> WindowProxy::associateWithWrapper(
     DOMWindow* window,
     const WrapperTypeInfo* wrapperTypeInfo,
     v8::Local<v8::Object> wrapper) {
   if (m_world->domDataStore().set(m_isolate, window, wrapperTypeInfo,
                                   wrapper)) {
     wrapperTypeInfo->wrapperCreated();
     V8DOMWrapper::setNativeInfo(m_isolate, wrapper, wrapperTypeInfo, window);
     DCHECK(V8DOMWrapper::hasInternalFieldsSet(wrapper));
   }
   SECURITY_CHECK(toScriptWrappable(wrapper) == window);
   return wrapper;
 }
 
 }  // namespace blink