Using WeakPtr for requests to MediaStreamDispatcher.

content/renderer/media/mock_media_stream_dispatcher.cc

Index: content/renderer/media/mock_media_stream_dispatcher.cc
diff --git a/content/renderer/media/mock_media_stream_dispatcher.cc b/content/renderer/media/mock_media_stream_dispatcher.cc
index 16894bf8f938773606911e4502d476d6be74671a..4a85e39d42c608b212b880908b9f9bb153916b16 100644
--- a/content/renderer/media/mock_media_stream_dispatcher.cc
+++ b/content/renderer/media/mock_media_stream_dispatcher.cc
@@ -7,7 +7,6 @@
 MockMediaStreamDispatcher::MockMediaStreamDispatcher()
     : MediaStreamDispatcher(NULL),
       request_id_(-1),
-      event_handler_(NULL),
       components_(NULL),
       stop_stream_counter_(0) {
 }
@@ -16,7 +15,7 @@ MockMediaStreamDispatcher::~MockMediaStreamDispatcher() {}
 
 void MockMediaStreamDispatcher::GenerateStream(
     int request_id,
-    MediaStreamDispatcherEventHandler* event_handler,
+    const base::WeakPtr<MediaStreamDispatcherEventHandler>& event_handler,
     media_stream::StreamOptions components,
     const std::string& security_origin) {
   request_id_ = request_id;