core/platform: Include wtf files using "wtf/foo.h" form.

Source/core/platform/graphics/GeneratorGeneratedImage.h

 /*
  * Copyright (C) 2008, 2012 Apple Computer, 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef GeneratorGeneratedImage_h
 #define GeneratorGeneratedImage_h
 
 #include "core/platform/Timer.h"
 #include "core/platform/graphics/GeneratedImage.h"
 #include "core/platform/graphics/Gradient.h"
 #include "core/platform/graphics/Image.h"
 #include "core/platform/graphics/ImageBuffer.h"
 #include "core/platform/graphics/IntSize.h"
-#include <wtf/RefPtr.h>
+#include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 static const int generatedImageCacheClearDelay = 1;
 
 class GeneratorGeneratedImage : public GeneratedImage {
 public:
     static PassRefPtr<GeneratorGeneratedImage> create(PassRefPtr<Gradient> generator, const IntSize& size)
     {
         return adoptRef(new GeneratorGeneratedImage(generator, size));
@@ skipping 27 matching lines @@
 
     OwnPtr<ImageBuffer> m_cachedImageBuffer;
     DeferrableOneShotTimer<GeneratorGeneratedImage> m_cacheTimer;
     IntSize m_cachedAdjustedSize;
     unsigned m_cachedGeneratorHash;
 };
 
 }
 
 #endif