Part 2 of base::IDMap refactor to eliminate IDMapOwnPointer/IDMapExternalPointer modes

chrome/browser/media/android/router/media_router_android.h

Index: chrome/browser/media/android/router/media_router_android.h
diff --git a/chrome/browser/media/android/router/media_router_android.h b/chrome/browser/media/android/router/media_router_android.h
index 9a89801f2ca92e4976bcd84c44510d14ca0d1d25..cb8685b6fe9348aef637ac7659e1aaba9ac2c3b6 100644
--- a/chrome/browser/media/android/router/media_router_android.h
+++ b/chrome/browser/media/android/router/media_router_android.h
@@ -160,14 +160,13 @@ class MediaRouterAndroid : public MediaRouterBase {
     std::vector<MediaRouteResponseCallback> callbacks;
   };
 
-  using MediaRouteRequests =
-      IDMap<MediaRouteRequest, IDMapOwnPointer>;
+  using MediaRouteRequests = IDMap<std::unique_ptr<MediaRouteRequest>>;
   MediaRouteRequests route_requests_;
 
   using MediaRoutes = std::vector<MediaRoute>;
   MediaRoutes active_routes_;
 
-  using SendMessageCallbacks = IDMap<SendRouteMessageCallback, IDMapOwnPointer>;
+  using SendMessageCallbacks = IDMap<std::unique_ptr<SendRouteMessageCallback>>;
   SendMessageCallbacks message_callbacks_;
 
   using MessageObservers = base::ScopedPtrHashMap<