Cleanup namespace usage in Source/web/*.h

Source/web/WebDevToolsFrontendImpl.h

 /*
  * Copyright (C) 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 26 matching lines @@
 #include "wtf/Forward.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class WebDevToolsClientDelegate;
 class WebViewImpl;
 struct WebDevToolsMessageData;
 
-using WTF::String;
-
 class WebDevToolsFrontendImpl FINAL : public WebDevToolsFrontend {
     WTF_MAKE_NONCOPYABLE(WebDevToolsFrontendImpl);
 public:
     WebDevToolsFrontendImpl(
         WebViewImpl*,
         WebDevToolsFrontendClient*,
         const String& applicationLocale);
     virtual ~WebDevToolsFrontendImpl();
 
     // WebDevToolsFrontend implementation.
     virtual void dispatchOnInspectorFrontend(const WebString& message) OVERRIDE;
 
 private:
     class InspectorFrontendResumeObserver;
     void resume();
     void maybeDispatch(Timer<WebDevToolsFrontendImpl>*);
     void doDispatchOnInspectorFrontend(const WebString& message);
 
     WebViewImpl* m_webViewImpl;
     WebDevToolsFrontendClient* m_client;
     String m_applicationLocale;
     OwnPtr<InspectorFrontendResumeObserver> m_inspectorFrontendResumeObserver;
     Deque<WebString> m_messages;
     Timer<WebDevToolsFrontendImpl> m_inspectorFrontendDispatchTimer;
 };
 
 } // namespace blink
 
 #endif