[Bookmark suggestions] Clean-up in the api: switch const* to const&

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>
@@ skipping 69 matching lines @@
   void BookmarkNodeFaviconChanged(
       bookmarks::BookmarkModel* model,
       const bookmarks::BookmarkNode* node) override {}
   void BookmarkNodeChildrenReordered(
       bookmarks::BookmarkModel* model,
       const bookmarks::BookmarkNode* node) override {}
   void BookmarkAllUserNodesRemoved(
       bookmarks::BookmarkModel* model,
       const std::set<GURL>& removed_urls) override {}
 
-  void ConvertBookmark(const bookmarks::BookmarkNode* bookmark,
+  void ConvertBookmark(const bookmarks::BookmarkNode& bookmark,
                        std::vector<ContentSuggestion>* suggestions);
 
   // The actual method to fetch bookmarks - follows each call to FetchBookmarks
   // but not sooner than the BookmarkModel gets loaded.
   void FetchBookmarksInternal();
 
   // Queries the BookmarkModel for recently visited bookmarks and pushes the
   // results to the ContentSuggestionService. The actual fetching does not
   // happen before the Bookmark model gets loaded.
   void FetchBookmarks();
@@ skipping 13 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_