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

content/public/browser/web_ui_controller.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 CONTENT_PUBLIC_BROWSER_WEB_UI_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_UI_CONTROLLER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "content/common/content_export.h"
 
 class GURL;
 class RenderViewHost;
+class WebUI;
 
 namespace base {
 class ListValue;
 }
 
 namespace content {
 
 // A WebUI page is controller by the embedder's WebUIController object. It
 // manages the data source and message handlers.
 class CONTENT_EXPORT WebUIController {
  public:
+  explicit WebUIController(WebUI* web_ui) : web_ui_(web_ui) {}
   virtual ~WebUIController() {}
 
   // Allows the controller to override handling all messages from the page.
   // Return true if the message handling was overridden.
   virtual bool OverrideHandleWebUIMessage(const GURL& source_url,
                                           const std::string& message,
                                           const base::ListValue& args);
 
   // Called when RenderView is first created. This is *not* called for every
   // page load because in some cases a RenderView will be reused. In those
   // cases, RenderViewReused will be called instead.
   virtual void RenderViewCreated(RenderViewHost* render_view_host) {}
 
   // Called when a RenderView is reused to display a page.
   virtual void RenderViewReused(RenderViewHost* render_view_host) {}
 
   // Called when this becomes the active WebUI instance for a re-used
   // RenderView; this is the point at which this WebUI instance will receive
   // DOM messages instead of the previous WebUI instance.
   //
   // If a WebUI instance has code that is usually triggered from a JavaScript
   // onload handler, this should be overridden to check to see if the web page's
   // DOM is still intact (e.g., due to a back/forward navigation that remains
   // within the same page), and if so trigger that code manually since onload
   // won't be run in that case.
   virtual void DidBecomeActiveForReusedRenderView() {}
+
+  WebUI* web_ui() const { return web_ui_; }
+
+ private:
+  WebUI* web_ui_;
+
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_UI_CONTROLLER_H_