[Media Router] Connection state change listening redesign part 2.

chrome/browser/media/router/media_route.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_ROUTE_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_H_
 
 #include <string>
 
 #include "base/containers/small_map.h"
@@ skipping 65 matching lines @@
  private:
   MediaRoute::Id media_route_id_;
   MediaSource media_source_;
   MediaSink::Id media_sink_id_;
   std::string description_;
   bool is_local_;
   std::string custom_controller_path_;
   bool for_display_;
 };
 
-class MediaRouteIdToPresentationSessionMapping {
- public:
-  MediaRouteIdToPresentationSessionMapping();
-  ~MediaRouteIdToPresentationSessionMapping();
-
-  void Add(const MediaRoute::Id& route_id,
-           const content::PresentationSessionInfo& session_info);
-  void Remove(const MediaRoute::Id& route_id);
-  void Clear();
-
-  // Gets the PresentationSessionInfo corresponding to |route_id| or nullptr
-  // if it does not exist. Caller should not hold on to the returned pointer.
-  const content::PresentationSessionInfo* Get(
-      const MediaRoute::Id& route_id) const;
-
- private:
-  base::SmallMap<std::map<MediaRoute::Id, content::PresentationSessionInfo>>
-      route_id_to_presentation_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaRouteIdToPresentationSessionMapping);
-};
-
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTE_H_