Refactor the P2PSocketDispatcher to be created on the RenderThread instead of the RenderView.

content/renderer/media/media_stream_impl.cc

Index: content/renderer/media/media_stream_impl.cc
diff --git a/content/renderer/media/media_stream_impl.cc b/content/renderer/media/media_stream_impl.cc
index 141e1453a275cdfa2aebc7e3fb2f7170b586f7df..974319c88e4014bbef74e6eba97474c69a505a22 100644
--- a/content/renderer/media/media_stream_impl.cc
+++ b/content/renderer/media/media_stream_impl.cc
@@ -363,10 +363,6 @@ void MediaStreamImpl::FrameWillClose(WebKit::WebFrame* frame) {
   }
 }
 
-void MediaStreamImpl::OnSocketDispatcherDestroyed() {
-  CleanupPeerConnectionFactory();
-}
-
 void MediaStreamImpl::InitializeWorkerThread(talk_base::Thread** thread,
                                              base::WaitableEvent* event) {
   jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();
@@ -421,7 +417,6 @@ bool MediaStreamImpl::EnsurePeerConnectionFactory() {
           base::Unretained(this),
           &event));
     event.Wait();
-    p2p_socket_dispatcher_->AddDestructionObserver(this);
   }
 
   if (!socket_factory_.get()) {
@@ -461,7 +456,6 @@ void MediaStreamImpl::CleanupPeerConnectionFactory() {
     } else {
       NOTREACHED() << "Worker thread not running.";
     }
-    p2p_socket_dispatcher_->RemoveDestructionObserver(this);
   }
 }