[Sync] Replace typedef with using.

components/sync/engine_impl/debug_info_event_listener_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/engine_impl/debug_info_event_listener.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace syncer {
 
-typedef testing::Test DebugInfoEventListenerTest;
+using DebugInfoEventListenerTest = testing::Test;
 
 TEST_F(DebugInfoEventListenerTest, VerifyEventsAdded) {
   DebugInfoEventListener debug_info_event_listener;
   debug_info_event_listener.CreateAndAddEvent(
       sync_pb::SyncEnums::ENCRYPTION_COMPLETE);
   ASSERT_EQ(debug_info_event_listener.events_.size(), 1U);
   const sync_pb::DebugEventInfo& debug_info =
       debug_info_event_listener.events_.back();
   ASSERT_TRUE(debug_info.has_singleton_event());
   ASSERT_EQ(debug_info.singleton_event(),
@@ skipping 30 matching lines @@
 TEST_F(DebugInfoEventListenerTest, VerifyClearEvents) {
   DebugInfoEventListener debug_info_event_listener;
   debug_info_event_listener.CreateAndAddEvent(
       sync_pb::SyncEnums::ENCRYPTION_COMPLETE);
   ASSERT_EQ(debug_info_event_listener.events_.size(), 1U);
   debug_info_event_listener.ClearDebugInfo();
   ASSERT_EQ(debug_info_event_listener.events_.size(), 0U);
 }
 
 }  // namespace syncer