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

chrome/browser/ui/webui/feedback_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_FEEDBACK_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_FEEDBACK_UI_H_
 
 #include <string>
 
 #include "chrome/browser/ui/webui/html_dialog_ui.h"
 
 class Browser;
 
 namespace browser {
 void ShowHtmlFeedbackView(Browser* browser,
                           const std::string& description_template,
                           const std::string& category_tag);
 }  // namespace browser
 
 class FeedbackUI : public HtmlDialogUI {
  public:
-  explicit FeedbackUI(content::WebContents* contents);
+  explicit FeedbackUI(WebUI* web_ui);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FeedbackUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FEEDBACK_UI_H_