Replace refcounting with weak pointers for BookmarkStore.

components/bookmarks/browser/bookmark_model.h

 // Copyright 2014 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_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_
 #define COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_
 
 #include <map>
 #include <set>
 #include <vector>
@@ skipping 393 matching lines @@
   // WARNING: |nodes_ordered_by_url_set_| is accessed on multiple threads. As
   // such, be sure and wrap all usage of it around |url_lock_|.
   typedef std::multiset<BookmarkNode*, NodeURLComparator> NodesOrderedByURLSet;
   NodesOrderedByURLSet nodes_ordered_by_url_set_;
   base::Lock url_lock_;
 
   // Used for loading favicons.
   base::CancelableTaskTracker cancelable_task_tracker_;
 
   // Reads/writes bookmarks to disk.
-  scoped_refptr<bookmarks::BookmarkStorage> store_;
+  scoped_ptr<bookmarks::BookmarkStorage> store_;
 
   scoped_ptr<bookmarks::BookmarkIndex> index_;
 
   // True if URLs are stored in the BookmarkIndex in addition to bookmark
   // titles.
   const bool index_urls_;
 
   base::WaitableEvent loaded_signal_;
 
   // See description of IsDoingExtensiveChanges above.
   int extensive_changes_;
 
   scoped_ptr<bookmarks::BookmarkExpandedStateTracker> expanded_state_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModel);
 };
 
 #endif  // COMPONENTS_BOOKMARKS_BROWSER_BOOKMARK_MODEL_H_