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

chrome/browser/ui/webui/html_dialog_ui.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_UI_WEBUI_HTML_DIALOG_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_HTML_DIALOG_UI_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 28 matching lines @@
   virtual string16 GetDialogTitle() const = 0;
 
   // Get the HTML file path for the content to load in the dialog.
   virtual GURL GetDialogContentURL() const = 0;
 
   // Get WebUIMessageHandler objects to handle messages from the HTML/JS page.
   // The handlers are used to send and receive messages from the page while it
   // is still open.  Ownership of each handler is taken over by the WebUI
   // hosting the page.
   virtual void GetWebUIMessageHandlers(
-      std::vector<WebUIMessageHandler*>* handlers) const = 0;
+      std::vector<content::WebUIMessageHandler*>* handlers) const = 0;
 
   // Get the size of the dialog.
   virtual void GetDialogSize(gfx::Size* size) const = 0;
 
   // Gets the JSON string input to use when showing the dialog.
   virtual std::string GetDialogArgs() const = 0;
 
   // A callback to notify the delegate that the dialog closed.
   // IMPORTANT: Implementations should delete |this| here (unless they've
   // arranged for the delegate to be deleted in some other way, e.g. by
@@ skipping 73 matching lines @@
 // Intended to be the place to collect the settings and lockdowns
 // necessary for running external UI components securely (e.g., the
 // cloud print dialog).
 class ExternalHtmlDialogUI : public HtmlDialogUI {
  public:
   explicit ExternalHtmlDialogUI(content::WebContents* web_contents);
   virtual ~ExternalHtmlDialogUI();
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_HTML_DIALOG_UI_H_