Revert 114320 - [V8] Don't delete the per context data until the V8IsolatedContext is deleted

Source/WebCore/bindings/v8/V8IsolatedContext.cpp

 /*
  * 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 87 matching lines @@
     //        created contexts so that they can all be updated when the
     //        document domain
     //        changes.
     m_context->get()->UseDefaultSecurityToken();
 
     m_frame->loader()->client()->didCreateScriptContext(context(), extensionGroup, m_world->id());
 }
 
 void V8IsolatedContext::destroy()
 {
+    m_perContextData.clear();
     m_frame->loader()->client()->willReleaseScriptContext(context(), m_world->id());
     m_context->get().MakeWeak(this, &contextWeakReferenceCallback);
     m_frame = 0;
 }
 
 V8IsolatedContext::~V8IsolatedContext()
 {
     m_context->disposeHandle();
 }
 
 void V8IsolatedContext::setSecurityOrigin(PassRefPtr<SecurityOrigin> securityOrigin)
 {
     m_securityOrigin = securityOrigin;
 }
 
 } // namespace WebCore