Avoid retaining the pointer to inspected WebContents in DevToolsWindow

chrome/browser/devtools/devtools_window.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_DEVTOOLS_DEVTOOLS_WINDOW_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVTOOLS_WINDOW_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 180 matching lines @@
       const std::vector<DevToolsFileHelper::FileSystem>& file_systems);
   void FileSystemAdded(std::string error_string,
                        const DevToolsFileHelper::FileSystem& file_system);
 
   void UpdateBrowserToolbar();
   bool IsDocked();
   static DevToolsDockSide GetDockSideFromPrefs(Profile* profile);
   static std::string SideToString(DevToolsDockSide dock_side);
   static DevToolsDockSide SideFromString(const std::string& dock_side);
 
+  content::WebContents* GetInspectedWebContents();
+
+  class InspectedWebContentsObserver;
+  scoped_ptr<InspectedWebContentsObserver> inspected_contents_observer_;
+
   Profile* profile_;
-  content::WebContents* inspected_web_contents_;
   content::WebContents* web_contents_;
   Browser* browser_;
   DevToolsDockSide dock_side_;
   bool is_loaded_;
   DevToolsToggleAction action_on_load_;
   content::NotificationRegistrar registrar_;
   scoped_ptr<content::DevToolsClientHost> frontend_host_;
   base::WeakPtrFactory<DevToolsWindow> weak_factory_;
   scoped_ptr<DevToolsFileHelper> file_helper_;
   int width_;
   int height_;
   DISALLOW_COPY_AND_ASSIGN(DevToolsWindow);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVTOOLS_WINDOW_H_