[Media Router] Design MediaRouter interface with stub implementation.

chrome/browser/media/router/media_routes_observer.cc

Index: chrome/browser/media/router/media_routes_observer.cc
diff --git a/chrome/browser/media/router/media_route_id.h b/chrome/browser/media/router/media_routes_observer.cc
similarity index 50%
copy from chrome/browser/media/router/media_route_id.h
copy to chrome/browser/media/router/media_routes_observer.cc
index 7bdfb57415459a7a00cb5822d92f6e4897607def..f0c9f9ecb6b4a0e8c36a77f1ad63c4eec43cfd5c 100644
--- a/chrome/browser/media/router/media_route_id.h
+++ b/chrome/browser/media/router/media_routes_observer.cc
@@ -2,15 +2,14 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_ID_H_
-#define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_ID_H_
-
-#include <string>
+#include "chrome/browser/media/router/media_routes_observer.h"
 
 namespace media_router {
 
-using MediaRouteId = std::string;
+RoutesQueryResult::RoutesQueryResult() {
+}
 
-}  // namespace media_router
+RoutesQueryResult::~RoutesQueryResult() {
+}
 
-#endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_ID_H_
+}  // namespace media_router