[Media Router] Remove the extension ID getter from MRMojoImpl

chrome/browser/ui/webui/media_router/media_router_ui.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_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 26 matching lines @@
 
 namespace U_ICU_NAMESPACE {
 class Collator;
 }
 
 class Browser;
 
 namespace media_router {
 
 class CreatePresentationConnectionRequest;
+class EventPageRequestManager;
 class IssuesObserver;
 class MediaRoute;
 class MediaRouter;
 class MediaRoutesObserver;
 class MediaRouterWebUIMessageHandler;
 class MediaSink;
 class RouteRequestResult;
 
 // Implements the chrome://media-router user interface.
 class MediaRouterUI
@@ skipping 350 matching lines @@
   // Holding a WeakPtr to PresentationServiceDelegateImpl is the cleanest way to
   // handle this.
   // TODO(imcheng): hold a weak ptr to an abstract type instead.
   base::WeakPtr<PresentationServiceDelegateImpl> presentation_service_delegate_;
 
   content::WebContents* initiator_;
 
   // Pointer to the MediaRouter for this instance's BrowserContext.
   MediaRouter* router_;
 
+  // Request manager for the Media Router component extension.
+  EventPageRequestManager* event_page_request_manager_;

[imcheng, 2017/07/07 21:15:43]

Make the pointer const.

[takumif, 2017/07/07 21:58:58]

Making it a pointer to a const object. The pointer itself cannot be const
because it's set in the ctor body.

+
   // The start time for UI initialization metrics timer. When a dialog has been
   // been painted and initialized with initial data, this should be cleared.
   base::Time start_time_;
 
   // The observer for the route controller. Notifies |handler_| of media status
   // updates.
   std::unique_ptr<UIMediaRouteControllerObserver> route_controller_observer_;
 
   // The dialog that handles opening the file dialog and validating and
   // returning the results.
   std::unique_ptr<MediaRouterFileDialog> media_router_file_dialog_;
 
   // If set, a cast mode that is required to be shown first.
   base::Optional<MediaCastMode> forced_cast_mode_;
 
   // NOTE: Weak pointers must be invalidated before all other member variables.
   // Therefore |weak_factory_| must be placed at the end.
   base::WeakPtrFactory<MediaRouterUI> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaRouterUI);
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_UI_WEBUI_MEDIA_ROUTER_MEDIA_ROUTER_UI_H_