[Sync] Replace typedef with using.

components/sync/driver/generic_change_processor.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_GENERIC_CHANGE_PROCESSOR_H_
 #define COMPONENTS_SYNC_DRIVER_GENERIC_CHANGE_PROCESSOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 17 matching lines @@
 class SyncClient;
 class SyncData;
 class SyncableService;
 class WriteNode;
 class WriteTransaction;
 
 namespace syncable {
 class Entry;
 }  // namespace syncable
 
-typedef std::vector<SyncData> SyncDataList;
+using SyncDataList = std::vector<SyncData>;
 
 // Datatype agnostic change processor. One instance of GenericChangeProcessor
 // is created for each datatype and lives on the datatype's sequence. It then
 // handles all interaction with the sync api, both translating pushes from the
 // local service into transactions and receiving changes from the sync model,
 // which then get converted into SyncChange's and sent to the local service.
 //
 // As a rule, the GenericChangeProcessor is not thread safe, and should only
 // be used on the same sequence in which it was created.
 class GenericChangeProcessor : public ChangeProcessor,
@@ skipping 137 matching lines @@
       attachment_service_weak_ptr_factory_;
   AttachmentServiceProxy attachment_service_proxy_;
   base::WeakPtrFactory<GenericChangeProcessor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GenericChangeProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_GENERIC_CHANGE_PROCESSOR_H_