[Bookmark suggestions] Remove an obsolete pref entry

components/ntp_snippets/bookmarks/bookmark_suggestions_provider.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_SNIPPETS_BOOKMARKS_BOOKMARK_SUGGESTIONS_PROVIDER_H_
 #define COMPONENTS_NTP_SNIPPETS_BOOKMARKS_BOOKMARK_SUGGESTIONS_PROVIDER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "components/bookmarks/browser/bookmark_model_observer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/ntp_snippets/category.h"
 #include "components/ntp_snippets/category_status.h"
 #include "components/ntp_snippets/content_suggestions_provider.h"
 
-class PrefRegistrySimple;
-class PrefService;
-
 namespace ntp_snippets {
 
 // Provides content suggestions from the bookmarks model.
 class BookmarkSuggestionsProvider : public ContentSuggestionsProvider,
                                     public bookmarks::BookmarkModelObserver {
  public:
   BookmarkSuggestionsProvider(ContentSuggestionsProvider::Observer* observer,
-                              bookmarks::BookmarkModel* bookmark_model,
-                              PrefService* pref_service);
+                              bookmarks::BookmarkModel* bookmark_model);
   ~BookmarkSuggestionsProvider() override;
 
-  static void RegisterProfilePrefs(PrefRegistrySimple* registry);
-
  private:
   // ContentSuggestionsProvider implementation.
   CategoryStatus GetCategoryStatus(Category category) override;
   CategoryInfo GetCategoryInfo(Category category) override;
   void DismissSuggestion(const ContentSuggestion::ID& suggestion_id) override;
   void FetchSuggestionImage(const ContentSuggestion::ID& suggestion_id,
                             const ImageFetchedCallback& callback) override;
   void Fetch(const Category& category,
              const std::set<std::string>& known_suggestion_ids,
              const FetchDoneCallback& callback) override;
@@ skipping 68 matching lines @@
   // deciding which bookmarks to suggest. Should we also consider visits on
   // desktop platforms?
   bool consider_bookmark_visits_from_desktop_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkSuggestionsProvider);
 };
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_BOOKMARKS_BOOKMARK_SUGGESTIONS_PROVIDER_H_