ntp_tiles: Migrate to multi-observer model

components/ntp_tiles/webui/ntp_tiles_internals_message_handler.h

 // Copyright 2016 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 COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_
 #define COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 32 matching lines @@
   void SendSourceInfo();
   void SendTiles(const NTPTilesVector& tiles);
 
   // MostVisitedSites::Observer.
   void OnMostVisitedURLsAvailable(const NTPTilesVector& tiles) override;
   void OnIconMadeAvailable(const GURL& site_url) override;
 
   // Bridge to embedder's API.
   NTPTilesInternalsMessageHandlerClient* client_;
 
-  int site_count_;
   std::unique_ptr<MostVisitedSites> most_visited_sites_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPTilesInternalsMessageHandler);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_WEBUI_NTP_TILES_INTERNALS_MESSAGE_HANDLER_H_