[Presentation API / Media Router] Clean up default pres URL logic.

content/renderer/presentation/presentation_dispatcher.cc

Index: content/renderer/presentation/presentation_dispatcher.cc
diff --git a/content/renderer/presentation/presentation_dispatcher.cc b/content/renderer/presentation/presentation_dispatcher.cc
index 9eb9c679569150bb720d5c320bf872014cf3cbdf..1a249e8ad08b8883e459bd383960f605dc803fea 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -337,11 +337,6 @@ void PresentationDispatcher::OnDefaultSessionStarted(
   if (!controller_)
     return;
 
-  // Reset the callback to get the next event.
-  presentation_service_->ListenForDefaultSessionStart(base::Bind(
-      &PresentationDispatcher::OnDefaultSessionStarted,
-      base::Unretained(this)));
-
   if (!session_info.is_null()) {
     controller_->didStartDefaultSession(
         new PresentationConnectionClient(session_info.Clone()));
@@ -426,9 +421,6 @@ void PresentationDispatcher::ConnectToPresentationServiceIfNeeded() {
   binding_.Bind(GetProxy(&client_ptr));
   presentation_service_->SetClient(client_ptr.Pass());
 
-  presentation_service_->ListenForDefaultSessionStart(base::Bind(
-      &PresentationDispatcher::OnDefaultSessionStarted,
-      base::Unretained(this)));
   presentation_service_->ListenForSessionStateChange();
 }