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

Source/platform/graphics/GeneratedImage.h

Index: Source/platform/graphics/GeneratedImage.h
diff --git a/Source/platform/graphics/GeneratedImage.h b/Source/platform/graphics/GeneratedImage.h
index a3b77c92f47efd4917f60d609a63f483812fb6f4..a69ede2127068e3ed684fe55e9b27bb4aa31e0d9 100644
--- a/Source/platform/graphics/GeneratedImage.h
+++ b/Source/platform/graphics/GeneratedImage.h
@@ -50,7 +50,7 @@ public:
 protected:
     virtual void drawPattern(GraphicsContext*, const FloatRect&,
         const FloatSize&, const FloatPoint&, CompositeOperator,
-        const FloatRect&, blink::WebBlendMode, const IntSize& repeatSpacing) OVERRIDE = 0;
+        const FloatRect&, WebBlendMode, const IntSize& repeatSpacing) OVERRIDE = 0;
 
     // FIXME: Implement this to be less conservative.
     virtual bool currentFrameKnownToBeOpaque() OVERRIDE { return false; }
@@ -60,6 +60,6 @@ protected:
     IntSize m_size;
 };
 
-}
+} // namespace blink
 
 #endif