[Media Router] Use DialMediaSinkService in MediaRouterMojoImpl

chrome/browser/media/router/discovery/dial/dial_media_sink_service.h

 // Copyright 2017 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_DISCOVERY_DIAL_DIAL_MEDIA_SINK_SERVICE_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_MEDIA_SINK_SERVICE_H_
 
 #include <memory>
 #include <set>
 
@@ skipping 13 matching lines @@
 class DialMediaSinkService : public MediaSinkService,
                              public DialRegistry::Observer {
  public:
   DialMediaSinkService(const OnSinksDiscoveredCallback& callback,
                        net::URLRequestContextGetter* request_context);
   ~DialMediaSinkService() override;
 
   // MediaSinkService implementation
   void Start() override;
 
-  void Stop();
+  virtual void Stop();
 
  protected:
   virtual DialRegistry* dial_registry();
 
   // Returns instance of device description service. Create a new one if none
   // exists.
   virtual DeviceDescriptionService* GetDescriptionService();
 
  private:
   friend class DialMediaSinkServiceTest;
@@ skipping 35 matching lines @@
 
   // Device data list from current round of discovery.
   DialRegistry::DeviceList current_devices_;
 
   scoped_refptr<net::URLRequestContextGetter> request_context_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_DISCOVERY_DIAL_DIAL_MEDIA_SINK_SERVICE_H_