[Sync] Replace typedef with using.

components/browser_sync/profile_sync_service_bookmark_unittest.cc

 // 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.
 
 // TODO(akalin): This file is basically just a unit test for
 // BookmarkChangeProcessor.  Write unit tests for
 // BookmarkModelAssociator separately.
 
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 1586 matching lines @@
   ASSERT_TRUE(test_user_share()->Reload());
   EXPECT_EQ(0u, test_user_share()->GetDeleteJournalSize());
 }
 
 struct TestData {
   const char* title;
   const char* url;
 };
 
 // Map from bookmark node ID to its version.
-typedef std::map<int64_t, int64_t> BookmarkNodeVersionMap;
+using BookmarkNodeVersionMap = std::map<int64_t, int64_t>;
 
 // TODO(ncarter): Integrate the existing TestNode/PopulateNodeFromString code
 // in the bookmark model unittest, to make it simpler to set up test data
 // here (and reduce the amount of duplication among tests), and to reduce the
 // duplication.
 class ProfileSyncServiceBookmarkTestWithData
     : public ProfileSyncServiceBookmarkTest {
  public:
   ProfileSyncServiceBookmarkTestWithData();
 
@@ skipping 975 matching lines @@
   EXPECT_EQ(syncer::kInvalidId, sync_id);
 
   // Verify that Sync ignores deleting this node.
   model()->Remove(node);
   EXPECT_EQ(sync_bookmark_count, GetSyncBookmarkCount());
 }
 
 }  // namespace
 
 }  // namespace browser_sync