Add NewTabPage.MostVisited and .SuggestionsImpression on Android

components/ntp_tiles/most_visited_sites.h

 // Copyright 2013 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_MOST_VISITED_SITES_H_
 #define COMPONENTS_NTP_TILES_MOST_VISITED_SITES_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 211 matching lines @@
       SuggestionsVector popular_suggestions);
 
   void SaveCurrentSuggestionsToPrefs();
 
   // Notifies the observer about the availability of suggestions.
   // Also records impressions UMA if not done already.
   void NotifyMostVisitedURLsObserver();
 
   void OnPopularSitesAvailable(bool success);
 
-  // Records thumbnail-related UMA histogram metrics.
-  void RecordThumbnailUMAMetrics();
-
   // Records UMA histogram metrics related to the number of impressions.
   void RecordImpressionUMAMetrics();
 
   // history::TopSitesObserver implementation.
   void TopSitesLoaded(history::TopSites* top_sites) override;
   void TopSitesChanged(history::TopSites* top_sites,
                        ChangeReason change_reason) override;
 
   PrefService* prefs_;
   const TemplateURLService* template_url_service_;
@@ skipping 39 matching lines @@
 
   // For callbacks may be run after destruction.
   base::WeakPtrFactory<MostVisitedSites> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedSites);
 };
 
 }  // namespace ntp_tiles
 
 #endif  // COMPONENTS_NTP_TILES_MOST_VISITED_SITES_H_