[Sync] Replace typedef with using.

components/sync/engine/model_safe_worker.h

 // Copyright 2012 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_ENGINE_MODEL_SAFE_WORKER_H_
 #define COMPONENTS_SYNC_ENGINE_MODEL_SAFE_WORKER_H_
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/atomic_flag.h"
 #include "components/sync/base/model_type.h"
 #include "components/sync/base/syncer_error.h"
 
 namespace base {
 class DictionaryValue;
 }  // namespace base
 
 namespace syncer {
 
-typedef base::Callback<enum SyncerError(void)> WorkCallback;
+using WorkCallback = base::Callback<enum SyncerError(void)>;
 
 enum ModelSafeGroup {
   GROUP_PASSIVE = 0,   // Models that are just "passively" being synced; e.g.
                        // changes to these models don't need to be pushed to a
                        // native model.
   GROUP_UI,            // Models that live on UI thread and are being synced.
   GROUP_DB,            // Models that live on DB thread and are being synced.
   GROUP_FILE,          // Models that live on FILE thread and are being synced.
   GROUP_HISTORY,       // Models that live on history thread and are being
                        // synced.
@@ skipping 48 matching lines @@
 
   // Whether the worker should do more work. Set when sync is disabled.
   base::AtomicFlag stopped_;
 
   DISALLOW_COPY_AND_ASSIGN(ModelSafeWorker);
 };
 
 // A map that details which ModelSafeGroup each ModelType
 // belongs to.  Routing info can change in response to the user enabling /
 // disabling sync for certain types, as well as model association completions.
-typedef std::map<ModelType, ModelSafeGroup> ModelSafeRoutingInfo;
+using ModelSafeRoutingInfo = std::map<ModelType, ModelSafeGroup>;
 
 // Caller takes ownership of return value.
 std::unique_ptr<base::DictionaryValue> ModelSafeRoutingInfoToValue(
     const ModelSafeRoutingInfo& routing_info);
 
 std::string ModelSafeRoutingInfoToString(
     const ModelSafeRoutingInfo& routing_info);
 
 ModelTypeSet GetRoutingInfoTypes(const ModelSafeRoutingInfo& routing_info);
 
 ModelSafeGroup GetGroupForModelType(const ModelType type,
                                     const ModelSafeRoutingInfo& routes);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_MODEL_SAFE_WORKER_H_