[Sync] Replace typedef with using.

components/sync/driver/sync_api_component_factory.h

Index: components/sync/driver/sync_api_component_factory.h
diff --git a/components/sync/driver/sync_api_component_factory.h b/components/sync/driver/sync_api_component_factory.h
index 122fc1110b54c8c51a1a680ed7edd2f20b3bccef..a8e0692ae16a2ed5745b538ec5baa18a5aad008d 100644
--- a/components/sync/driver/sync_api_component_factory.h
+++ b/components/sync/driver/sync_api_component_factory.h
@@ -48,10 +48,10 @@ class SyncApiComponentFactory {
   // 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