Move WebUIMessageHandler to its own file in the public directory and put it in the content namesp...

content/browser/webui/generic_handler.h

 // Copyright (c) 2011 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 CONTENT_BROWSER_WEBUI_GENERIC_HANDLER_H_
 #define CONTENT_BROWSER_WEBUI_GENERIC_HANDLER_H_
 #pragma once
 
-#include "content/browser/webui/web_ui.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
 namespace base {
 class ListValue;
 }
 
 // A place to add handlers for messages shared across all WebUI pages.
-class GenericHandler : public WebUIMessageHandler {
+class GenericHandler : public content::WebUIMessageHandler {
  public:
   GenericHandler();
   virtual ~GenericHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
  private:
   void HandleNavigateToUrl(const base::ListValue* args);
 
   DISALLOW_COPY_AND_ASSIGN(GenericHandler);
 };
 
 #endif  // CONTENT_BROWSER_WEBUI_GENERIC_HANDLER_H_