[Sync] Replace typedef with using.

components/sync/driver/sync_api_component_factory.h

 // Copyright 2014 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_SYNC_DRIVER_SYNC_API_COMPONENT_FACTORY_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_API_COMPONENT_FACTORY_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 30 matching lines @@
 
 // This factory provides sync driver code with the model type specific sync/api
 // service (like SyncableService) implementations.
 class SyncApiComponentFactory {
  public:
   virtual ~SyncApiComponentFactory() {}
   // Callback to allow platform-specific datatypes to register themselves as
   // data type controllers.
   // |disabled_types| and |enabled_types| control the disable/enable state of
   // types that are on or off by default (respectively).
-  typedef base::Callback<void(SyncService* sync_service,
-                              ModelTypeSet disabled_types,
-                              ModelTypeSet enabled_types)>
-      RegisterDataTypesMethod;
+  using RegisterDataTypesMethod =
+      base::Callback<void(SyncService* sync_service,
+                          ModelTypeSet disabled_types,
+                          ModelTypeSet enabled_types)>;
 
   // The various factory methods for the data type model associators
   // and change processors all return this struct.  This is needed
   // because the change processors typically require a type-specific
   // model associator at construction time.
   //
   // Note: This interface is deprecated in favor of the SyncableService API.
   // New datatypes that do not live on the UI thread should directly return a
   // weak pointer to a SyncableService. All others continue to return
   // SyncComponents. It is safe to assume that the factory methods below are
@@ skipping 53 matching lines @@
       std::unique_ptr<AttachmentStoreForSync> attachment_store,
       const UserShare& user_share,
       const std::string& store_birthday,
       ModelType model_type,
       AttachmentService::Delegate* delegate) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_API_COMPONENT_FACTORY_H_