[Sync] Replace typedef with using.

components/browser_sync/profile_sync_test_util.h

 // Copyright 2016 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_BROWSER_SYNC_PROFILE_SYNC_TEST_UTIL_H_
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_TEST_UTIL_H_
 
 #include <memory>
 
 #include "base/callback.h"
@@ skipping 41 matching lines @@
 // Call this to register preferences needed for ProfileSyncService creation.
 void RegisterPrefsForProfileSyncService(
     user_prefs::PrefRegistrySyncable* registry);
 
 // Aggregate this class to get all necessary support for creating a
 // ProfileSyncService in tests. The test still needs to have its own
 // MessageLoop, though.
 class ProfileSyncServiceBundle {
  public:
 #if defined(OS_CHROMEOS)
-  typedef FakeSigninManagerBase FakeSigninManagerType;
+  using FakeSigninManagerType = FakeSigninManagerBase;
 #else
-  typedef FakeSigninManager FakeSigninManagerType;
+  using FakeSigninManagerType = FakeSigninManager;
 #endif
 
   ProfileSyncServiceBundle();
 
   ~ProfileSyncServiceBundle();
 
   // Builders
 
   // Builds a child of FakeSyncClient which overrides some of the client's
   // accessors to return objects from the bundle.
@@ skipping 103 matching lines @@
   sync_sessions::FakeSyncSessionsClient sync_sessions_client_;
   invalidation::FakeInvalidationService fake_invalidation_service_;
   scoped_refptr<net::URLRequestContextGetter> url_request_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncServiceBundle);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_TEST_UTIL_H_