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

chrome/browser/ui/webui/chromeos/sim_unlock_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_SIM_UNLOCK_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_SIM_UNLOCK_UI_H_
 #pragma once
 
-#include "content/browser/webui/web_ui.h"
 #include "content/public/browser/web_ui_controller.h"
 
 namespace chromeos {
 
 // A custom WebUI that defines datasource for SIM unlock dialog that is used
 // in Chrome OS for specific tasks:
 // - Unlock SIM card (enter PIN/PUK codes).
 // - Display "SIM card is blocked" message when there're no PUK tries left.
-class SimUnlockUI : public WebUI, public content::WebUIController {
+class SimUnlockUI : public content::WebUIController {
  public:
-  explicit SimUnlockUI(content::WebContents* contents);
+  explicit SimUnlockUI(WebUI* web_ui);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SimUnlockUI);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_SIM_UNLOCK_UI_H_