Start splitting out WebUI into an implementation class and an interface that each page implements...

chrome/browser/ui/webui/chromeos/proxy_settings_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_CHROMEOS_PROXY_SETTINGS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_PROXY_SETTINGS_UI_H_
 #pragma once
 
 #include "chrome/browser/ui/webui/options/options_ui.h"
 #include "content/browser/webui/web_ui.h"
+#include "content/public/browser/web_ui_controller.h"
 
 namespace chromeos {
 
 class ProxyHandler;
 
 // A WebUI to host proxy settings splitted from settings page for better
 // performance.
-class ProxySettingsUI : public WebUI,
+class ProxySettingsUI : public WebUI, public content::WebUIController,
                         public OptionsPageUIHandlerHost {
  public:
   explicit ProxySettingsUI(content::WebContents* contents);
   virtual ~ProxySettingsUI();
 
  private:
   // Overridden from OptionsPageUIHandlerHost:
   virtual void InitializeHandlers() OVERRIDE;
 
   chromeos::ProxyHandler* proxy_handler_;  // Weak ptr.
 
   DISALLOW_COPY_AND_ASSIGN(ProxySettingsUI);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_PROXY_SETTINGS_UI_H_