[Media Router] 2nd take on fix route response callback lifetime in UI.

chrome/test/media_router/media_router_e2e_browsertest.h

 // Copyright 2015 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_TEST_MEDIA_ROUTER_MEDIA_ROUTER_E2E_BROWSERTEST_H_
 #define CHROME_TEST_MEDIA_ROUTER_MEDIA_ROUTER_E2E_BROWSERTEST_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 14 matching lines @@
  protected:
   // InProcessBrowserTest Overrides
   void SetUpOnMainThread() override;
   void TearDownOnMainThread() override;
 
   // MediaRouterBaseBrowserTest Overrides
   void ParseCommandLine() override;
 
   // Callback from MediaRouter when a response to a media route request is
   // received.
-  void OnRouteResponseReceived(scoped_ptr<MediaRoute> route,
+  void OnRouteResponseReceived(const MediaRoute* route,
                                const std::string& error);
 
   // Initializes |observer_| to listen for sinks compatible with |source|,
   // finds sink with name matching receiver_, and establishes media
   // route between the source and sink.
   // |observer_| and |route_id_| will be initialized.
   // |origin| is the URL of requestor's page.
   // |tab_id| is the ID of the tab in which the request was made.
   // |origin| and |tab_id| are used for enforcing same-origin and/or same-tab
   // scope for JoinRoute() requests. (e.g., if enforced, the page
@@ skipping 18 matching lines @@
   std::string receiver_;
 
   MediaRouter* media_router_;
   scoped_ptr<TestMediaSinksObserver> observer_;
   MediaRoute::Id route_id_;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_TEST_MEDIA_ROUTER_MEDIA_ROUTER_E2E_BROWSERTEST_H_