Remove provider index from Android NewTabPage histograms

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 125 matching lines @@
   };
 
   struct Suggestion {
     base::string16 title;
     GURL url;
     MostVisitedSource source;
 
     // Only valid for source == WHITELIST (empty otherwise).
     base::FilePath whitelist_icon_path;
 
-    // Only valid for source == SUGGESTIONS_SERVICE (-1 otherwise).
-    int provider_index;
-
     Suggestion();
     ~Suggestion();
 
     Suggestion(Suggestion&&);
     Suggestion& operator=(Suggestion&&);
 
    private:
     DISALLOW_COPY_AND_ASSIGN(Suggestion);
   };
 
   MostVisitedSites(scoped_refptr<base::SequencedWorkerPool> blocking_pool,
                    PrefService* prefs,
                    const TemplateURLService* template_url_service,
                    variations::VariationsService* variations_service,
                    net::URLRequestContextGetter* download_context,
                    const base::FilePath& popular_sites_directory,
                    scoped_refptr<history::TopSites> top_sites,
                    suggestions::SuggestionsService* suggestions,
                    MostVisitedSitesSupervisor* supervisor);
 
   ~MostVisitedSites() override;
 
   // Does not take ownership of |observer|, which must outlive this object and
   // must not be null.
   void SetMostVisitedURLsObserver(Observer* observer, int num_sites);
 
   void AddOrRemoveBlacklistedUrl(const GURL& url, bool add_url);
   void RecordTileTypeMetrics(const std::vector<int>& tile_types,
-                             const std::vector<int>& sources,
-                             const std::vector<int>& provider_indices);
+                             const std::vector<int>& sources);
   void RecordOpenedMostVisitedItem(int index, int tile_type);
 
   // MostVisitedSitesSupervisor::Observer implementation.
   void OnBlockedSitesChanged() override;
 
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
  private:
   friend class MostVisitedSitesTest;
 
@@ skipping 99 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_