Clean up forward declarations in Source/core/css

Source/core/css/resolver/StyleBuilder.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 19 matching lines @@
 
 #ifndef StyleBuilder_h
 #define StyleBuilder_h
 
 #include "core/CSSPropertyNames.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class CSSValue;
-class Document;
-class RenderStyle;
 class StyleResolverState;
 
 class StyleBuilder {
     STATIC_ONLY(StyleBuilder);
 public:
     static void applyProperty(CSSPropertyID, StyleResolverState&, CSSValue*);
 
 private:
     static void applyProperty(CSSPropertyID, StyleResolverState&, CSSValue*, bool isInitial, bool isInherit);
 };
 
 }
 
 #endif