Cleanup namespace usage in Source/web/*.h

Source/web/PageOverlayList.h

 /*
  * Copyright (C) 2011 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.
  *
@@ skipping 16 matching lines @@
  */
 
 #ifndef PageOverlayList_h
 #define PageOverlayList_h
 
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
+
 class GraphicsContext;
 class GraphicsLayer;
-}
-
-namespace blink {
 class PageOverlay;
 class WebPageOverlay;
 class WebViewImpl;
 
 class PageOverlayList {
 public:
     static PassOwnPtr<PageOverlayList> create(WebViewImpl*);
 
     ~PageOverlayList();
 
     bool empty() const { return !m_pageOverlays.size(); }
 
     // Adds/removes a PageOverlay for given client.
     // Returns true if a PageOverlay is added/removed.
     bool add(WebPageOverlay*, int /* zOrder */);
     bool remove(WebPageOverlay*);
 
     void update();
-    void paintWebFrame(blink::GraphicsContext&);
+    void paintWebFrame(GraphicsContext&);
 
-    size_t findGraphicsLayer(blink::GraphicsLayer*);
+    size_t findGraphicsLayer(GraphicsLayer*);
 
 private:
     typedef Vector<OwnPtr<PageOverlay>, 2> PageOverlays;
 
     explicit PageOverlayList(WebViewImpl*);
 
     // Returns the index of the client found. Otherwise, returns WTF::kNotFound.
     size_t find(WebPageOverlay*);
 
     WebViewImpl* m_viewImpl;
     PageOverlays m_pageOverlays;
 };
 
 } // namespace blink
 
 #endif // PageOverlayList_h