[Sync] Replace typedef with using.

components/sync/model/sync_change_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.
 
 #include "components/sync/model/sync_change.h"
 
 #include <memory>
 
 #include "base/message_loop/message_loop.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "components/sync/model/attachments/attachment_id.h"
 #include "components/sync/model/attachments/attachment_service_proxy_for_test.h"
 #include "components/sync/protocol/preference_specifics.pb.h"
 #include "components/sync/protocol/proto_value_conversions.h"
 #include "components/sync/protocol/sync.pb.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
 // Ordered list of SyncChange's.
-typedef std::vector<SyncChange> SyncChangeList;
+using SyncChangeList = std::vector<SyncChange>;
 
 namespace {
 
 class SyncChangeTest : public testing::Test {
  private:
   base::MessageLoop message_loop;
 };
 
 TEST_F(SyncChangeTest, LocalDelete) {
   SyncChange::SyncChangeType change_type = SyncChange::ACTION_DELETE;
@@ skipping 104 matching lines @@
   EXPECT_EQ(SyncChange::ACTION_DELETE, e.change_type());
   EXPECT_EQ(PREFERENCES, e.sync_data().GetDataType());
   ref_spec = EntitySpecificsToValue(delete_specifics);
   e_spec = EntitySpecificsToValue(e.sync_data().GetSpecifics());
   EXPECT_TRUE(ref_spec->Equals(e_spec.get()));
 }
 
 }  // namespace
 
 }  // namespace syncer