[Sync] Replace typedef with using.

chrome/browser/sync/profile_sync_service_factory.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 CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_
 #define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 10 matching lines @@
 class ProfileSyncService;
 }  // namespace browser_sync
 
 namespace syncer {
 class SyncClient;
 class SyncService;
 }  // namespace syncer
 
 class ProfileSyncServiceFactory : public BrowserContextKeyedServiceFactory {
  public:
-  typedef base::Callback<std::unique_ptr<syncer::SyncClient>(Profile*)>
-      SyncClientFactory;
+  using SyncClientFactory =
+      base::Callback<std::unique_ptr<syncer::SyncClient>(Profile*)>;
 
   static browser_sync::ProfileSyncService* GetForProfile(Profile* profile);
   static bool HasProfileSyncService(Profile* profile);
 
   // Convenience method that returns the ProfileSyncService as a
   // syncer::SyncService.
   static syncer::SyncService* GetSyncServiceForBrowserContext(
       content::BrowserContext* context);
 
   static ProfileSyncServiceFactory* GetInstance();
@@ skipping 12 matching lines @@
       content::BrowserContext* context) const override;
 
   // A factory function for overriding the way the SyncClient is created.
   // This is a raw pointer so it can be statically initialized.
   static SyncClientFactory* client_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncServiceFactory);
 };
 
 #endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_