Implement CancelUserMediaRequest for the browser part

content/browser/renderer_host/media/media_stream_dispatcher_host.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/browser/renderer_host/media/media_stream_dispatcher_host.h"
 
 #include "content/common/media/media_stream_messages.h"
 #include "content/common/media/media_stream_options.h"
 #include "googleurl/src/gurl.h"
 
@@ skipping 196 matching lines @@
                             components, security_origin, &label);
   DCHECK(!label.empty());
   streams_[label] = StreamRequest(render_view_id, page_request_id);
 }
 
 void MediaStreamDispatcherHost::OnCancelGenerateStream(int render_view_id,
                                                        int page_request_id) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnCancelGenerateStream("
            << render_view_id << ", "
            << page_request_id << ")";
-  // TODO(perkj): Implement
-  NOTIMPLEMENTED();
+
+  for (StreamMap::iterator it = streams_.begin(); it != streams_.end(); ++it) {
+    if (it->second.render_view_id == render_view_id &&
+        it->second.page_request_id == page_request_id) {
+      manager()->CancelGenerateStream(it->first);
+    }
+  }
 }
 
 void MediaStreamDispatcherHost::OnStopGeneratedStream(
     int render_view_id, const std::string& label) {
   DVLOG(1) << "MediaStreamDispatcherHost::OnStopGeneratedStream("
            << ", {label = " << label <<  "})";
 
   StreamMap::iterator it = streams_.find(label);
   DCHECK(it != streams_.end());
   manager()->StopGeneratedStream(label);
@@ skipping 37 matching lines @@
   DCHECK(!label.empty());
   streams_[label] = StreamRequest(render_view_id, page_request_id);
 }
 
 MediaStreamManager* MediaStreamDispatcherHost::manager() {
   return MediaStreamManager::GetForResourceContext(
       resource_context_, audio_manager_);
 }
 
 }  // namespace media_stream