blink: Cleanup core class forward declarations

third_party/WebKit/Source/core/css/CSSFontSelectorClient.h

 /*
  * Copyright (C) 2014 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 19 matching lines @@
 
 #ifndef CSSFontSelectorClient_h
 #define CSSFontSelectorClient_h
 
 #include "core/CoreExport.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class CSSFontSelector;
-class Visitor;
 
 class CORE_EXPORT CSSFontSelectorClient : public GarbageCollectedMixin {
  public:
   virtual ~CSSFontSelectorClient() {}
 
   virtual void fontsNeedUpdate(CSSFontSelector*) = 0;
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 };
 
 }  // namespace blink
 
 #endif  // CSSFontSelectorClient_h