chrome: Cleanup class/struct forward declarations

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 25 matching lines @@
 namespace U_ICU_NAMESPACE {
 class Collator;
 }
 
 namespace media_router {
 
 class CreatePresentationConnectionRequest;
 class IssuesObserver;
 class MediaRoute;
 class MediaRouter;
-class MediaRouterDialogCallbacks;
 class MediaRoutesObserver;
 class MediaRouterWebUIMessageHandler;
 class MediaSink;
-class MediaSinksObserver;
 class RouteRequestResult;
 
 // Implements the chrome://media-router user interface.
 class MediaRouterUI : public ConstrainedWebDialogUI,
                       public QueryResultManager::Observer,
                       public PresentationServiceDelegateImpl::
                           DefaultPresentationRequestObserver {
  public:
   // |web_ui| owns this object and is used to initialize the base class.
   explicit MediaRouterUI(content::WebUI* web_ui);
@@ skipping 275 matching lines @@
   // 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_