[Media Router] Make MRUIService dispose its dependencies on MRMojoImpl in Shutdown()

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 a473e1e5abad8390e46e717b64904a588b411df7..5823f0f02fd8be6d23c8536a727963eaa895147c 100644
--- a/chrome/browser/media/router/media_router_ui_service.cc
+++ b/chrome/browser/media/router/media_router_ui_service.cc
@@ -11,17 +11,21 @@
 namespace media_router {
 
 MediaRouterUIService::MediaRouterUIService(Profile* profile)
-    : action_controller_(profile) {}
+    : action_controller_(new MediaRouterActionController(profile)) {}
 
 MediaRouterUIService::~MediaRouterUIService() {}
 
+void MediaRouterUIService::Shutdown() {
+  action_controller_.reset();
+}
+
 // static
 MediaRouterUIService* MediaRouterUIService::Get(Profile* profile) {
   return MediaRouterUIServiceFactory::GetForBrowserContext(profile);
 }
 
 MediaRouterActionController* MediaRouterUIService::action_controller() {
-  return &action_controller_;
+  return action_controller_.get();
 }
 
 }  // namespace media_router