Cleanup namespace usage in platform/graphics/[G-S]*

Source/platform/graphics/OpaqueRectTrackingContentLayerDelegate.h

 /*
  * Copyright (C) 2012 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:
  * 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 27 matching lines @@
 class IntRect;
 
 class PLATFORM_EXPORT GraphicsContextPainter {
 public:
     virtual void paint(GraphicsContext&, const IntRect& clip) = 0;
 
 protected:
     virtual ~GraphicsContextPainter() { }
 };
 
-class PLATFORM_EXPORT OpaqueRectTrackingContentLayerDelegate : public blink::WebContentLayerClient {
+class PLATFORM_EXPORT OpaqueRectTrackingContentLayerDelegate : public WebContentLayerClient {
     WTF_MAKE_NONCOPYABLE(OpaqueRectTrackingContentLayerDelegate);
 public:
     explicit OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter*);
     virtual ~OpaqueRectTrackingContentLayerDelegate();
 
     // If we know that everything that will be painted through this delegate, then we don't bother
     // tracking opaqueness.
     void setOpaque(bool opaque) { m_opaque = opaque; }
 
-    // blink::WebContentLayerClient implementation.
-    virtual void paintContents(SkCanvas*, const blink::WebRect& clip, bool canPaintLCDText, blink::WebFloatRect& opaque,
-        blink::WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) OVERRIDE;
+    // WebContentLayerClient implementation.
+    virtual void paintContents(SkCanvas*, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque,
+        WebContentLayerClient::GraphicsContextStatus = GraphicsContextEnabled) OVERRIDE;
 
 private:
     GraphicsContextPainter* m_painter;
     bool m_opaque;
 };
 
-}
+} // namespace blink
 
 #endif // OpaqueRectTrackingContentLayerDelegate_h