Clean up forward declarations in Source/core

Source/core/testing/Internals.h

 /*
  * Copyright (C) 2012 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 28 matching lines @@
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class CanvasRenderingContext2D;
 class ClientRect;
 class ClientRectList;
 class DOMArrayBuffer;
 class DOMPoint;
-class DOMStringList;
 class DictionaryTest;
 class Document;
 class DocumentFragment;
 class DocumentMarker;
 class Element;
 class ExceptionState;
-class ExecutionContext;
 class GCObservation;
 class HTMLElement;
 class HTMLMediaElement;
 class InternalRuntimeFlags;
 class InternalSettings;
 class Iterator;
 class LayerRectList;
 class LocalDOMWindow;
 class LocalFrame;
 class Node;
@@ skipping 278 matching lines @@
     Vector<String> iconURLs(Document*, int iconTypesMask) const;
     PassRefPtrWillBeRawPtr<ClientRectList> annotatedRegions(Document*, bool draggable, ExceptionState&);
 
     DocumentMarker* markerAt(Node*, const String& markerType, unsigned index, ExceptionState&);
     Member<InternalRuntimeFlags> m_runtimeFlags;
 };
 
 } // namespace blink
 
 #endif // Internals_h