Cleanup namespace usage in platform/graphics/[filters/* to skia/*] and platform/graphics/[B-D]*

Source/platform/graphics/gpu/WebGLImageBufferSurface.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 18 matching lines @@
  */
 
 #ifndef WebGLImageBufferSurface_h
 #define WebGLImageBufferSurface_h
 
 #include "platform/graphics/ImageBufferSurface.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "wtf/OwnPtr.h"
 
 namespace blink {
+
 class WebGraphicsContext3DProvider;
-}
-
-namespace blink {
 
 // This is a GPU backed surface that has no canvas or render target.
 class PLATFORM_EXPORT WebGLImageBufferSurface : public ImageBufferSurface {
     WTF_MAKE_NONCOPYABLE(WebGLImageBufferSurface); WTF_MAKE_FAST_ALLOCATED;
 public:
     WebGLImageBufferSurface(const IntSize&, OpacityMode = NonOpaque);
     virtual ~WebGLImageBufferSurface();
 
     virtual SkCanvas* canvas() const OVERRIDE { return 0; }
     virtual const SkBitmap& bitmap() OVERRIDE { return m_bitmap; }
     virtual bool isValid() const OVERRIDE { return m_bitmap.pixelRef(); }
     virtual bool isAccelerated() const OVERRIDE { return true; }
     virtual Platform3DObject getBackingTexture() const OVERRIDE;
     virtual bool cachedBitmapEnabled() const OVERRIDE { return true; }
     virtual const SkBitmap& cachedBitmap() const OVERRIDE { return m_cachedBitmap; }
     virtual void invalidateCachedBitmap() OVERRIDE;
     virtual void updateCachedBitmapIfNeeded() OVERRIDE;
 
 private:
     SkBitmap m_bitmap;
     // This raw-pixel based SkBitmap works as a cache at CPU side to avoid heavy cost
     // on readback from GPU side to CPU side in some cases.
     SkBitmap m_cachedBitmap;
-    OwnPtr<blink::WebGraphicsContext3DProvider> m_contextProvider;
+    OwnPtr<WebGraphicsContext3DProvider> m_contextProvider;
 };
 
-
 } // namespace blink
 
 #endif