Clean up forward declarations and include files in Source/bindings

Source/bindings/core/v8/V8PerIsolateData.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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef V8PerIsolateData_h
 #define V8PerIsolateData_h
 
 #include "bindings/core/v8/ScopedPersistent.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8HiddenValue.h"
 #include "bindings/core/v8/WrapperTypeInfo.h"
-#include "gin/public/gin_embedders.h"
 #include "gin/public/isolate_holder.h"
 #include "modules/indexeddb/IDBPendingTransactionMonitor.h"
-#include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/Vector.h"
 #include <v8.h>
 
 namespace blink {
 
 class DOMDataStore;
 class GCEventData;
 class StringCache;
 struct WrapperTypeInfo;
 
-class ExternalStringVisitor;
-
 typedef WTF::Vector<DOMDataStore*> DOMDataStoreList;
 
 class V8PerIsolateData {
 public:
     static v8::Isolate* initialize();
     static V8PerIsolateData* from(v8::Isolate* isolate)
     {
         ASSERT(isolate);
         ASSERT(isolate->GetData(gin::kEmbedderBlink));
         return static_cast<V8PerIsolateData*>(isolate->GetData(gin::kEmbedderBlink));
@@ skipping 76 matching lines @@
 #endif
     OwnPtr<GCEventData> m_gcEventData;
     bool m_performingMicrotaskCheckpoint;
 
     OwnPtr<IDBPendingTransactionMonitor> m_idbPendingTransactionMonitor;
 };
 
 } // namespace blink
 
 #endif // V8PerIsolateData_h