Quick fix for TabCapture UI indicator not getting removed after ending the capture

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/utf_string_conversions.h"
@@ skipping 457 matching lines @@
       }
 
       DCHECK_GE(iter->audio_ref_count, 0);
       DCHECK_GE(iter->video_ref_count, 0);
     }
 
     // Remove the tab if all the devices have been closed.
     if (iter->audio_ref_count == 0 && iter->video_ref_count == 0 &&
         iter->tab_capture_ref_count == 0)
       tabs_.erase(iter);
+
+    // Notify the cached web_contents if the render view has changed. We expect
+    // that it is still valid since we get a capture indicator removed event
+    // before the web_contents is destroyed.
+    if (!web_contents && iter->web_contents)
+      web_contents = iter->web_contents;
   }
 
   if (web_contents)
     web_contents->NotifyNavigationStateChanged(content::INVALIDATE_TYPE_TAB);
 
   if (!status_icon_)
     return;
 
   UpdateStatusTrayIconContextMenu();
 }
@@ skipping 24 matching lines @@
     return false;
 
   CaptureDeviceTabs::const_iterator iter = std::find_if(
       tabs_.begin(), tabs_.end(), TabEquals(web_contents,
                                             render_process_id,
                                             render_view_id));
   if (iter == tabs_.end())
     return false;
   return (iter->tab_capture_ref_count > 0);
 }