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

Source/platform/graphics/ImageLayerChromiumTest.cpp

Index: Source/platform/graphics/ImageLayerChromiumTest.cpp
diff --git a/Source/platform/graphics/ImageLayerChromiumTest.cpp b/Source/platform/graphics/ImageLayerChromiumTest.cpp
index 3849e2379de05128ab01d915a9d2aeee399d44b8..21367ded98c9a36bc998e94c7aeb989981e1567d 100644
--- a/Source/platform/graphics/ImageLayerChromiumTest.cpp
+++ b/Source/platform/graphics/ImageLayerChromiumTest.cpp
@@ -88,7 +88,7 @@ public:
     {
     }
 
-    virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&, CompositeOperator, blink::WebBlendMode) OVERRIDE
+    virtual void draw(GraphicsContext*, const FloatRect&, const FloatRect&, CompositeOperator, WebBlendMode) OVERRIDE
     {
     }
 
@@ -104,7 +104,7 @@ public:
     explicit GraphicsLayerForTesting(GraphicsLayerClient* client)
         : GraphicsLayer(client) { };
 
-    virtual blink::WebLayer* contentsLayer() const { return GraphicsLayer::contentsLayer(); }
+    virtual WebLayer* contentsLayer() const { return GraphicsLayer::contentsLayer(); }
 };
 
 TEST(ImageLayerChromiumTest, opaqueImages)