We have a problem in the process on destroying WebContentsImpl because

chrome/browser/extensions/api/desktop_capture/desktop_capture_api.h

 // Copyright 2013 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_EXTENSIONS_API_DESKTOP_CAPTURE_DESKTOP_CAPTURE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DESKTOP_CAPTURE_DESKTOP_CAPTURE_API_H_
 
 #include <map>
 
 #include "base/memory/singleton.h"
@@ skipping 34 matching lines @@
 
   void Cancel();
 
  private:
   virtual ~DesktopCaptureChooseDesktopMediaFunction();
 
   // ExtensionFunction overrides.
   virtual bool RunImpl() OVERRIDE;
 
   // content::WebContentsObserver overrides.
-  virtual void WebContentsDestroyed(
-      content::WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   void OnPickerDialogResults(content::DesktopMediaID source);
 
   int request_id_;
 
   // Parameters of the tab the stream is requested for.
   int render_process_id_;
   int render_view_id_;
   GURL origin_;
 
@@ skipping 45 matching lines @@
                    DesktopCaptureChooseDesktopMediaFunction*> RequestsMap;
 
   RequestsMap requests_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopCaptureRequestsRegistry);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DESKTOP_CAPTURE_DESKTOP_CAPTURE_API_H_