Clean up forward declarations in Source/core

Source/core/storage/StorageArea.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 19 matching lines @@
 #include "platform/heap/Handle.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExceptionState;
 class LocalFrame;
 class KURL;
-class Page;
 class SecurityOrigin;
 class Storage;
 class WebStorageArea;
 class WebStorageNamespace;
 
 enum StorageType {
     LocalStorage,
     SessionStorage
 };
 
@@ skipping 30 matching lines @@
     static bool isEventSource(Storage*, WebStorageArea* sourceAreaInstance);
 
     OwnPtr<WebStorageArea> m_storageArea;
     StorageType m_storageType;
     bool m_canAccessStorageCachedResult;
 };
 
 } // namespace blink
 
 #endif // StorageArea_h