[Sync] Replace typedef with using.

chrome/browser/sync/profile_sync_service_factory.h

Index: chrome/browser/sync/profile_sync_service_factory.h
diff --git a/chrome/browser/sync/profile_sync_service_factory.h b/chrome/browser/sync/profile_sync_service_factory.h
index 17b1f2dc83b348e7d07cb9fa2054f9703dd79bc5..621ecf398324a679e6b1b51633bffef12ab81099 100644
--- a/chrome/browser/sync/profile_sync_service_factory.h
+++ b/chrome/browser/sync/profile_sync_service_factory.h
@@ -28,8 +28,8 @@ class SyncService;
 
 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);