[Sync] Replace typedef with using.

components/sync/model/model_type_sync_bridge.h

 // Copyright 2015 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_MODEL_MODEL_TYPE_SYNC_BRIDGE_H_
 #define COMPONENTS_SYNC_MODEL_MODEL_TYPE_SYNC_BRIDGE_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 16 matching lines @@
 // Interface implemented by model types to receive updates from sync via a
 // ModelTypeChangeProcessor. Provides a way for sync to update the data and
 // metadata for entities, as well as the model type state. Sync bridge
 // implementations must provide their change_processor() with metadata through
 // ModelReadyToSync() as soon as possible. Once this is called, sync will
 // immediately begin locally tracking changes and can start syncing with the
 // server soon afterward. If an error occurs during startup, the processor's
 // ReportError() method should be called instead of ModelReadyToSync().
 class ModelTypeSyncBridge : public base::SupportsWeakPtr<ModelTypeSyncBridge> {
  public:
-  typedef base::Callback<void(std::unique_ptr<DataBatch>)> DataCallback;
-  typedef std::vector<std::string> StorageKeyList;
-  typedef base::RepeatingCallback<std::unique_ptr<ModelTypeChangeProcessor>(
-      ModelType type,
-      ModelTypeSyncBridge* bridge)>
-      ChangeProcessorFactory;
+  using DataCallback = base::Callback<void(std::unique_ptr<DataBatch>)>;
+  using StorageKeyList = std::vector<std::string>;
+  using ChangeProcessorFactory = base::RepeatingCallback<std::unique_ptr<
+      ModelTypeChangeProcessor>(ModelType type, ModelTypeSyncBridge* bridge)>;
 
   ModelTypeSyncBridge(const ChangeProcessorFactory& change_processor_factory,
                       ModelType type);
 
   virtual ~ModelTypeSyncBridge();
 
   // Creates an object used to communicate changes in the sync metadata to the
   // model type store.
   virtual std::unique_ptr<MetadataChangeList> CreateMetadataChangeList() = 0;
 
@@ skipping 77 matching lines @@
   const ModelType type_;
 
   const ChangeProcessorFactory change_processor_factory_;
 
   std::unique_ptr<ModelTypeChangeProcessor> change_processor_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_MODEL_MODEL_TYPE_SYNC_BRIDGE_H_