Remove unused isolatedWorldCount

sky/engine/bindings/core/v8/DOMWrapperWorld.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 26 matching lines @@
 #include "sky/engine/bindings/core/v8/V8Binding.h"
 #include "sky/engine/bindings/core/v8/V8DOMWrapper.h"
 #include "sky/engine/bindings/core/v8/WindowProxy.h"
 #include "sky/engine/bindings/core/v8/WrapperTypeInfo.h"
 #include "sky/engine/core/dom/ExecutionContext.h"
 #include "sky/engine/wtf/HashTraits.h"
 #include "sky/engine/wtf/StdLibExtras.h"
 
 namespace blink {
 
-unsigned DOMWrapperWorld::isolatedWorldCount = 0;
 DOMWrapperWorld* DOMWrapperWorld::worldOfInitializingWindow = 0;
 
 PassRefPtr<DOMWrapperWorld> DOMWrapperWorld::create(FakeWorldMarker marker)
 {
     return adoptRef(new DOMWrapperWorld(marker));
 }
 
 DOMWrapperWorld::DOMWrapperWorld(FakeWorldMarker marker)
     : m_isFakeWorld(marker == FakeWorld)
     , m_domDataStore(adoptPtr(new DOMDataStore(isMainWorld())))
@@ skipping 34 matching lines @@
     m_domObjectHolders.remove(holderBase);
 }
 
 void DOMWrapperWorld::weakCallbackForDOMObjectHolder(const v8::WeakCallbackData<v8::Value, DOMObjectHolderBase>& data)
 {
     DOMObjectHolderBase* holderBase = data.GetParameter();
     holderBase->world()->unregisterDOMObjectHolder(holderBase);
 }
 
 } // namespace blink