[Sync] Replace typedef with using.

components/sync/driver/data_type_status_table.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_DATA_TYPE_STATUS_TABLE_H_
 #define COMPONENTS_SYNC_DRIVER_DATA_TYPE_STATUS_TABLE_H_
 
 #include <map>
 #include <string>
 
 #include "components/sync/base/model_type.h"
 #include "components/sync/model/sync_error.h"
 
 namespace syncer {
 
 // Class to keep track of data types that have encountered an error during sync.
 class DataTypeStatusTable {
  public:
-  typedef std::map<ModelType, SyncError> TypeErrorMap;
+  using TypeErrorMap = std::map<ModelType, SyncError>;
 
   DataTypeStatusTable();
   DataTypeStatusTable(const DataTypeStatusTable& other);
   ~DataTypeStatusTable();
 
   // Copy and assign welcome.
 
   // Update the failed datatypes. Types will be added to their corresponding
   // error map based on their |error_type()|.
   void UpdateFailedDataTypes(const TypeErrorMap& errors);
@@ skipping 60 matching lines @@
   TypeErrorMap persistence_errors_;
 
   // List of data types that could not start due to not being ready. These can
   // be marked as ready by calling ResetUnreadyErrorFor(..).
   TypeErrorMap unready_errors_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_DATA_TYPE_STATUS_TABLE_H_