Clean up forward declarations in Source/core/editing

Source/core/editing/EditingStyle.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple 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.
@@ skipping 30 matching lines @@
 #include "wtf/RefCounted.h"
 #include "wtf/RefPtr.h"
 #include "wtf/TriState.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class CSSStyleDeclaration;
 class CSSComputedStyleDeclaration;
-class CSSPrimitiveValue;
-class CSSValue;
 class ContainerNode;
 class Document;
 class Element;
 class HTMLElement;
 class MutableStylePropertySet;
 class Node;
 class Position;
 class QualifiedName;
 class RenderStyle;
 class StylePropertySet;
@@ skipping 167 matching lines @@
     String m_applyFontSize;
 };
 
 // FIXME: Remove these functions or make them non-global to discourage using CSSStyleDeclaration directly.
 CSSValueID getIdentifierValue(CSSStyleDeclaration*, CSSPropertyID);
 CSSValueID getIdentifierValue(StylePropertySet*, CSSPropertyID);
 
 } // namespace blink
 
 #endif // EditingStyle_h