[Sync] Replace typedef with using.

components/sync_bookmarks/bookmark_model_associator.h

 // Copyright (c) 2012 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_SYNC_BOOKMARKS_BOOKMARK_MODEL_ASSOCIATOR_H_
 #define COMPONENTS_SYNC_BOOKMARKS_BOOKMARK_MODEL_ASSOCIATOR_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 95 matching lines @@
 
   void AbortAssociation() override {
     // No implementation needed, this associator runs on the main
     // thread.
   }
 
   // See ModelAssociator interface.
   bool CryptoReadyIfNecessary() override;
 
  private:
-  typedef std::map<int64_t, int64_t> BookmarkIdToSyncIdMap;
-  typedef std::map<int64_t, const bookmarks::BookmarkNode*>
-      SyncIdToBookmarkNodeMap;
-  typedef std::set<int64_t> DirtyAssociationsSyncIds;
-  typedef std::vector<const bookmarks::BookmarkNode*> BookmarkList;
-  typedef std::stack<const bookmarks::BookmarkNode*> BookmarkStack;
+  using BookmarkIdToSyncIdMap = std::map<int64_t, int64_t>;
+  using SyncIdToBookmarkNodeMap =
+      std::map<int64_t, const bookmarks::BookmarkNode*>;
+  using DirtyAssociationsSyncIds = std::set<int64_t>;
+  using BookmarkList = std::vector<const bookmarks::BookmarkNode*>;
+  using BookmarkStack = std::stack<const bookmarks::BookmarkNode*>;
 
   // Add association between native node and sync node to the maps.
   void AddAssociation(const bookmarks::BookmarkNode* node, int64_t sync_id);
 
   // Posts a task to persist dirty associations.
   void PostPersistAssociationsTask();
   // Persists all dirty associations.
   void PersistAssociations();
 
   // Result of the native model version check against the sync
@@ skipping 171 matching lines @@
   // guarantees no invocations can occur if |this| has been deleted. (This
   // allows this class to be non-refcounted).
   base::WeakPtrFactory<BookmarkModelAssociator> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkModelAssociator);
 };
 
 }  // namespace sync_bookmarks
 
 #endif  // COMPONENTS_SYNC_BOOKMARKS_BOOKMARK_MODEL_ASSOCIATOR_H_