[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 a2c7bc864083451d882759d71de7d608c5a065a3..d229b6fcaa0fd08e00a6ab128e2e7ad7afe28db7 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -335,11 +335,6 @@ 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()));
@@ -424,9 +419,6 @@ 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();
 }