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

chrome/browser/ui/webui/active_downloads_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_ACTIVE_DOWNLOADS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_ACTIVE_DOWNLOADS_UI_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "chrome/browser/history/history.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 #include "chrome/browser/ui/webui/html_dialog_ui.h"
 #include "net/base/directory_lister.h"
 
 class ActiveDownloadsHandler;
 class Browser;
 class Profile;
 
 namespace content {
 class DownloadItem;
 }
 
 class ActiveDownloadsUI : public HtmlDialogUI {
  public:
-  explicit ActiveDownloadsUI(content::WebContents* contents);
+  explicit ActiveDownloadsUI(WebUI* web_ui);
 
   static bool ShouldShowPopup(Profile* profile,
                               content::DownloadItem* download);
   static Browser* OpenPopup(Profile* profile);
   static Browser* GetPopup();
 
   // For testing.
   typedef std::vector<content::DownloadItem*> DownloadList;
   const DownloadList& GetDownloads() const;
 
  private:
   ActiveDownloadsHandler* handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ActiveDownloadsUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_ACTIVE_DOWNLOADS_UI_H_