Make WebUI objects not derive from WebUI. WebUI objects own the controller. This is the ownership...

chrome/browser/ui/webui/chromeos/mobile_setup_ui.h

 // Copyright (c) 2012 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_MOBILE_SETUP_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_MOBILE_SETUP_UI_H_
 #pragma once
 
 #include "base/memory/weak_ptr.h"
-#include "content/browser/webui/web_ui.h"
 #include "content/public/browser/web_ui_controller.h"
 
 class PortalFrameLoadObserver;
 // A custom WebUI that defines datasource for mobile setup registration page
 // that is used in Chrome OS activate modem and perform plan subscription tasks.
-class MobileSetupUI : public WebUI,
-                      public content::WebUIController,
+class MobileSetupUI : public content::WebUIController,
                       public base::SupportsWeakPtr<MobileSetupUI> {
  public:
-  explicit MobileSetupUI(content::WebContents* contents);
+  explicit MobileSetupUI(WebUI* web_ui);
 
   void OnObserverDeleted();
 
  private:
   // WebUIController overrides.
   virtual void RenderViewCreated(RenderViewHost* render_view_host) OVERRIDE;
 
   PortalFrameLoadObserver* frame_load_observer_;
   DISALLOW_COPY_AND_ASSIGN(MobileSetupUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_MOBILE_SETUP_UI_H_