Revert of [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 1a249e8ad08b8883e459bd383960f605dc803fea..9eb9c679569150bb720d5c320bf872014cf3cbdf 100644
--- a/content/renderer/presentation/presentation_dispatcher.cc
+++ b/content/renderer/presentation/presentation_dispatcher.cc
@@ -336,6 +336,11 @@
     presentation::PresentationSessionInfoPtr session_info) {
   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(
@@ -421,6 +426,9 @@
   binding_.Bind(GetProxy(&client_ptr));
   presentation_service_->SetClient(client_ptr.Pass());
 
+  presentation_service_->ListenForDefaultSessionStart(base::Bind(
+      &PresentationDispatcher::OnDefaultSessionStarted,
+      base::Unretained(this)));
   presentation_service_->ListenForSessionStateChange();
 }