Remove Media Router impl and BrowserContext factory.

chrome/browser/media/router/media_router_impl_factory.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_MEDIA_ROUTER_MEDIA_ROUTER_IMPL_FACTORY_H_
-#define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_IMPL_FACTORY_H_
-
-#include "base/memory/singleton.h"
-#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
-
-namespace content {
-class BrowserContext;
-}  // namespace content
-
-namespace media_router {
-
-class MediaRouterImpl;
-
-// A factory that returns a MediaRouter object for a given BrowserContext,
-// creating one lazily if needed.
-class MediaRouterImplFactory : public BrowserContextKeyedServiceFactory {
- public:
-  static MediaRouterImpl* GetMediaRouterForBrowserContext(
-      content::BrowserContext* context);
-  static MediaRouterImplFactory* GetInstance();
-
- private:
-  friend struct DefaultSingletonTraits<MediaRouterImplFactory>;
-
-  MediaRouterImplFactory();
-  ~MediaRouterImplFactory() override;
-
-  // BrowserContextKeyedBaseFactory
-  KeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* context) const override;
-  content::BrowserContext* GetBrowserContextToUse(
-      content::BrowserContext* context) const override;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaRouterImplFactory);
-};
-
-}  // namespace media_router
-
-#endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_IMPL_FACTORY_H_