Show Media Router toolbar icon ephemerally for MR dialogs

chrome/browser/media/router/media_router_ui_service.cc

Index: chrome/browser/media/router/media_router_ui_service.cc
diff --git a/chrome/browser/media/router/media_router_ui_service.cc b/chrome/browser/media/router/media_router_ui_service.cc
index 98cb3e60a05c9432dac08b67bf3361be05388084..5d0500cecd297af43531a55c2cda3a615b971542 100644
--- a/chrome/browser/media/router/media_router_ui_service.cc
+++ b/chrome/browser/media/router/media_router_ui_service.cc
@@ -11,7 +11,8 @@
 namespace media_router {
 
 MediaRouterUIService::MediaRouterUIService(Profile* profile)
-    : action_controller_(profile) {}
+    : action_controller_(
+          base::MakeUnique<MediaRouterActionController>(profile)) {}
 
 MediaRouterUIService::~MediaRouterUIService() {}
 
@@ -20,4 +21,8 @@ MediaRouterUIService* MediaRouterUIService::Get(Profile* profile) {
   return MediaRouterUIServiceFactory::GetForBrowserContext(profile);
 }
 
+MediaRouterActionController* MediaRouterUIService::action_controller() const {
+  return action_controller_.get();
+}
+
 }  // namespace media_router