We have a problem in the process on destroying WebContentsImpl because

chrome/browser/media/media_stream_capture_indicator.cc

 // 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.
 
 #include "chrome/browser/media/media_stream_capture_indicator.h"
 
 #include "base/bind.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 143 matching lines @@
       const content::MediaStreamDevices& devices);
 
   // Increment ref-counts up based on the type of each device provided.
   void AddDevices(const content::MediaStreamDevices& devices);
 
   // Decrement ref-counts up based on the type of each device provided.
   void RemoveDevices(const content::MediaStreamDevices& devices);
 
  private:
   // content::WebContentsObserver overrides.
-  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE {
-    indicator_->UnregisterWebContents(web_contents);
+  virtual void WebContentsDestroyed() OVERRIDE {
+    indicator_->UnregisterWebContents(web_contents());
     delete this;
   }
 
   scoped_refptr<MediaStreamCaptureIndicator> indicator_;
   int audio_ref_count_;
   int video_ref_count_;
   int mirroring_ref_count_;
 
   base::WeakPtrFactory<WebContentsDeviceUsage> weak_factory_;
 
@@ skipping 306 matching lines @@
   } else if (audio && !video) {
     message_id = IDS_MEDIA_STREAM_STATUS_TRAY_TEXT_AUDIO_ONLY;
     *image = *mic_image_;
   } else if (!audio && video) {
     message_id = IDS_MEDIA_STREAM_STATUS_TRAY_TEXT_VIDEO_ONLY;
     *image = *camera_image_;
   }
 
   *tool_tip = l10n_util::GetStringUTF16(message_id);
 }