Cleanup namespace usage in public/platform/Web[A-M]*.h.

public/platform/WebGamepadListener.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebGamepadListener_h
 #define WebGamepadListener_h
 
 #include "WebPlatformEventListener.h"
 
 namespace blink {
 
 class WebGamepad;
 
 class WebGamepadListener : public WebPlatformEventListener {
 public:
-    virtual void didConnectGamepad(unsigned index, const blink::WebGamepad&) = 0;
-    virtual void didDisconnectGamepad(unsigned index, const blink::WebGamepad&) = 0;
+    virtual void didConnectGamepad(unsigned index, const WebGamepad&) = 0;
+    virtual void didDisconnectGamepad(unsigned index, const WebGamepad&) = 0;
 
 protected:
     virtual ~WebGamepadListener() { }
 };
 
 } // namespace blink
 
 #endif