ntp_tiles: Add tests covering tile-fetching logic

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 10 matching lines @@
 #include "components/ntp_tiles/ntp_tile.h"
 #include "components/ntp_tiles/popular_sites.h"
 #include "components/suggestions/proto/suggestions.pb.h"
 #include "components/suggestions/suggestions_service.h"
 #include "url/gurl.h"
 
 namespace history {
 class TopSites;
 }
 
-namespace user_prefs {
-class PrefRegistrySyncable;
-}
+class PrefRegistrySimple;
+class PrefService;
 
 class PrefService;
 
 namespace ntp_tiles {
 
 class IconCacher;
 
 // Shim interface for SupervisedUserService.
 class MostVisitedSitesSupervisor {
  public:
@@ skipping 65 matching lines @@
   // Requests an asynchronous refresh of the suggestions. Notifies the observer
   // once the request completes.
   void Refresh();
 
   void AddOrRemoveBlacklistedUrl(const GURL& url, bool add_url);
   void ClearBlacklistedUrls();
 
   // MostVisitedSitesSupervisor::Observer implementation.
   void OnBlockedSitesChanged() override;
 
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+  static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
   // Workhorse for SaveNewTiles. Implemented as a separate static and public
   // method for ease of testing.
   static NTPTilesVector MergeTiles(NTPTilesVector personal_tiles,
                                    NTPTilesVector whitelist_tiles,
                                    NTPTilesVector popular_tiles);
 
  private:
   void BuildCurrentTiles();
 
@@ skipping 65 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_