[Popular Sites] Split PopularSites interface and PopularSitesImpl

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 57 matching lines @@
   virtual std::vector<Whitelist> whitelists() = 0;
 
   // If true, be conservative about suggesting sites from outside sources.
   virtual bool IsChildProfile() = 0;
 };
 
 // Tracks the list of most visited sites and their thumbnails.
 class MostVisitedSites : public history::TopSitesObserver,
                          public MostVisitedSitesSupervisor::Observer {
  public:
-  using PopularSitesVector = std::vector<PopularSites::Site>;
-
   // The observer to be notified when the list of most visited sites changes.
   class Observer {
    public:
     virtual void OnMostVisitedURLsAvailable(const NTPTilesVector& tiles) = 0;
     virtual void OnIconMadeAvailable(const GURL& site_url) = 0;
 
    protected:
     virtual ~Observer() {}
   };
 
@@ skipping 107 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_