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

chrome/browser/printing/cloud_print/cloud_print_setup_message_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 CHROME_BROWSER_PRINTING_CLOUD_PRINT_CLOUD_PRINT_SETUP_MESSAGE_HANDLER_H_
 #define CHROME_BROWSER_PRINTING_CLOUD_PRINT_CLOUD_PRINT_SETUP_MESSAGE_HANDLER_H_
 
 #include <string>
 
 #include "base/values.h"
-#include "chrome/browser/ui/webui/html_dialog_ui.h"
+#include "content/public/browser/web_ui_message_handler.h"
 
 class CloudPrintSetupFlow;
 
 // This class is used to handle DOM messages from the setup dialog.
-class CloudPrintSetupMessageHandler : public WebUIMessageHandler {
+class CloudPrintSetupMessageHandler : public content::WebUIMessageHandler {
  public:
   explicit CloudPrintSetupMessageHandler(CloudPrintSetupFlow* flow)
     : flow_(flow) {}
   virtual ~CloudPrintSetupMessageHandler() {}
 
  protected:
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
   // Callbacks from the page.
   void HandleSubmitAuth(const ListValue* args);
   void HandlePrintTestPage(const ListValue* args);
   void HandleLearnMore(const ListValue* args);
 
  private:
   CloudPrintSetupFlow* flow_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintSetupMessageHandler);
 };
 
 #endif  // CHROME_BROWSER_PRINTING_CLOUD_PRINT_CLOUD_PRINT_SETUP_MESSAGE_HANDLER_H_