MediaRouterAction: Only observe Media Routes when there is a local route.

chrome/browser/media/router/local_media_routes_observer.cc

Index: chrome/browser/media/router/local_media_routes_observer.cc
diff --git a/chrome/browser/media/router/media_routes_observer.cc b/chrome/browser/media/router/local_media_routes_observer.cc
similarity index 51%
copy from chrome/browser/media/router/media_routes_observer.cc
copy to chrome/browser/media/router/local_media_routes_observer.cc
index 5d83fb855b169eb07257304c9466170cbdd84b07..65348b07346fcda45447ca9eb805da17e0ba2030 100644
--- a/chrome/browser/media/router/media_routes_observer.cc
+++ b/chrome/browser/media/router/local_media_routes_observer.cc
@@ -2,21 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/media/router/media_routes_observer.h"
+#include "chrome/browser/media/router/local_media_routes_observer.h"
 
-#include "base/logging.h"
 #include "chrome/browser/media/router/media_router.h"
 
 namespace media_router {
 
-MediaRoutesObserver::MediaRoutesObserver(MediaRouter* router)
+LocalMediaRoutesObserver::LocalMediaRoutesObserver(MediaRouter* router)
     : router_(router) {
   DCHECK(router_);
-  router_->RegisterMediaRoutesObserver(this);
+  router_->RegisterLocalMediaRoutesObserver(this);
 }
 
-MediaRoutesObserver::~MediaRoutesObserver() {
-  router_->UnregisterMediaRoutesObserver(this);
+LocalMediaRoutesObserver::~LocalMediaRoutesObserver() {
+  router_->UnregisterLocalMediaRoutesObserver(this);
 }
 
 }  // namespace media_router