[Sync] Replace typedef with using.

components/sync/engine_impl/get_updates_processor.cc

 // 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.
 
 #include "components/sync/engine_impl/get_updates_processor.h"
 
 #include <stddef.h>
 
 #include <utility>
 
 #include "base/trace_event/trace_event.h"
 #include "components/sync/engine_impl/cycle/status_controller.h"
 #include "components/sync/engine_impl/cycle/sync_cycle.h"
 #include "components/sync/engine_impl/events/get_updates_response_event.h"
 #include "components/sync/engine_impl/get_updates_delegate.h"
 #include "components/sync/engine_impl/syncer_proto_util.h"
 #include "components/sync/engine_impl/update_handler.h"
 #include "components/sync/syncable/directory.h"
 #include "components/sync/syncable/nigori_handler.h"
 #include "components/sync/syncable/syncable_read_transaction.h"
 
 namespace syncer {
 
 namespace {
 
-typedef std::vector<const sync_pb::SyncEntity*> SyncEntityList;
-typedef std::map<ModelType, SyncEntityList> TypeSyncEntityMap;
-typedef std::map<ModelType, size_t> TypeToIndexMap;
+using SyncEntityList = std::vector<const sync_pb::SyncEntity*>;
+using TypeSyncEntityMap = std::map<ModelType, SyncEntityList>;
+using TypeToIndexMap = std::map<ModelType, size_t>;
 
 bool ShouldRequestEncryptionKey(SyncCycleContext* context) {
   syncable::Directory* dir = context->directory();
   syncable::ReadTransaction trans(FROM_HERE, dir);
   syncable::NigoriHandler* nigori_handler = dir->GetNigoriHandler();
   return nigori_handler->NeedKeystoreKey(&trans);
 }
 
 SyncerError HandleGetEncryptionKeyResponse(
     const sync_pb::ClientToServerResponse& update_response,
@@ skipping 323 matching lines @@
 }
 
 void GetUpdatesProcessor::CopyClientDebugInfo(
     DebugInfoGetter* debug_info_getter,
     sync_pb::DebugInfo* debug_info) {
   DVLOG(1) << "Copying client debug info to send.";
   debug_info_getter->GetDebugInfo(debug_info);
 }
 
 }  // namespace syncer