Clean up forward declarations in Source/core/frame

Source/core/frame/SettingsDelegate.h

 /*
  * Copyright (C) 2013 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 18 matching lines @@
  */
 
 #ifndef SettingsDelegate_h
 #define SettingsDelegate_h
 
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
 
-class Page;
 class Settings;
 
 class SettingsDelegate {
 public:
     explicit SettingsDelegate(PassOwnPtr<Settings>);
     virtual ~SettingsDelegate();
 
     Settings* settings() const { return m_settings.get(); }
 
     // We currently use an enum instead of individual invalidation
@@ skipping 14 matching lines @@
 
     virtual void settingsChanged(ChangeType) = 0;
 
 protected:
     OwnPtr<Settings> const m_settings;
 };
 
 } // namespace blink
 
 #endif // SettingsDelegate_h