Clean up forward declarations in Source/platform

Source/platform/graphics/GraphicsLayer.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 40 matching lines @@
 namespace blink {
 
 class FloatRect;
 class GraphicsContext;
 class GraphicsLayer;
 class GraphicsLayerFactory;
 class GraphicsLayerFactoryChromium;
 class Image;
 class JSONObject;
 class ScrollableArea;
-class TextStream;
 class WebCompositorAnimation;
 class WebLayer;
 
 // FIXME: find a better home for this declaration.
 class PLATFORM_EXPORT LinkHighlightClient {
 public:
     virtual void invalidate() = 0;
     virtual void clearCurrentGraphicsLayer() = 0;
     virtual WebLayer* layer() = 0;
 
@@ skipping 272 matching lines @@
 };
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void PLATFORM_EXPORT showGraphicsLayerTree(const blink::GraphicsLayer*);
 #endif
 
 #endif // GraphicsLayer_h