Support cancellation of request for opening device.

content/renderer/media/media_stream_impl.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 "content/renderer/media/media_stream_impl.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 480 matching lines @@
       // MediaStreamDispatcher know that the stream is no longer wanted.
       // If not, we cancel the request and delete the request object.
       if ((*request_it)->generated) {
         // Stop the local audio track before closing the device in the browser.
         dependency_factory_->StopLocalAudioSource((*request_it)->descriptor);
 
         media_stream_dispatcher_->StopStream(
             UTF16ToUTF8((*request_it)->descriptor.label()));
       } else {
         media_stream_dispatcher_->CancelGenerateStream(
-            (*request_it)->request_id);
+            (*request_it)->request_id, AsWeakPtr());
       }
       request_it = user_media_requests_.erase(request_it);
     } else {
       ++request_it;
     }
   }
 }
 
 scoped_refptr<webkit_media::VideoFrameProvider>
 MediaStreamImpl::CreateVideoFrameProvider(
@@ skipping 110 matching lines @@
   }
 
   for (size_t i = 0; i < video_sources.size(); ++i) {
     video_sources[i].setReadyState(
             WebKit::WebMediaStreamSource::ReadyStateEnded);
     video_sources[i].setExtraData(NULL);
   }
 }
 
 }  // namespace content