[MediaRouter] Replace RouteMessage with PresentationConnectionMessage

chrome/browser/media/router/route_message_observer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // 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_ROUTE_MESSAGE_OBSERVER_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_ROUTE_MESSAGE_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "chrome/common/media_router/media_route.h"
 
+namespace content {
+struct PresentationConnectionMessage;
+}
+
 namespace media_router {
 
 class MediaRouter;
-struct RouteMessage;
 
 // Observes messages originating from the MediaSink connected to a MediaRoute.
 // Messages are received from MediaRouter via |OnMessagesReceived|.
+// TODO(imcheng): Rename to PresentationConnectionMessageObserver.
 class RouteMessageObserver {
  public:
   // |route_id|: ID of MediaRoute to listen for messages.
   RouteMessageObserver(MediaRouter* router, const MediaRoute::Id& route_id);
 
   virtual ~RouteMessageObserver();
 
   // Invoked by |router_| whenever messages are received from the route sink.
   // |messages| is guaranteed to be non-empty.
   virtual void OnMessagesReceived(
-      const std::vector<RouteMessage>& messages) = 0;
+      const std::vector<content::PresentationConnectionMessage>& messages) = 0;
 
   const MediaRoute::Id& route_id() const { return route_id_; }
 
  private:
   MediaRouter* const router_;
   const MediaRoute::Id route_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RouteMessageObserver);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_ROUTE_MESSAGE_OBSERVER_H_