[Sync] Replace typedef with using.

components/sync/driver/shared_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_SHARED_CHANGE_PROCESSOR_H_
 #define COMPONENTS_SYNC_DRIVER_SHARED_CHANGE_PROCESSOR_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 35 matching lines @@
 // waiting for non-UI threads.
 //
 // Note: since we control the work being done while holding the lock, we ensure
 // no I/O or other intensive work is done while blocking the UI thread (all
 // the work is in-memory sync interactions).
 //
 // We use virtual methods so that we can use mock's in testing.
 class SharedChangeProcessor
     : public base::RefCountedThreadSafe<SharedChangeProcessor> {
  public:
-  typedef base::Callback<void(DataTypeController::ConfigureResult start_result,
-                              const SyncMergeResult& local_merge_result,
-                              const SyncMergeResult& syncer_merge_result)>
-      StartDoneCallback;
+  using StartDoneCallback =
+      base::Callback<void(DataTypeController::ConfigureResult start_result,
+                          const SyncMergeResult& local_merge_result,
+                          const SyncMergeResult& syncer_merge_result)>;
 
   // Create an uninitialized SharedChangeProcessor.
   explicit SharedChangeProcessor(ModelType type);
 
   void StartAssociation(StartDoneCallback start_done,
                         SyncClient* const sync_client,
                         GenericChangeProcessorFactory* processor_factory,
                         UserShare* user_share,
                         std::unique_ptr<DataTypeErrorHandler> error_handler);
 
@@ skipping 86 matching lines @@
   // The local service for this type. Only set if the DTC for the type uses
   // SharedChangeProcessor::StartAssociation().
   base::WeakPtr<SyncableService> local_service_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedChangeProcessor);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_SHARED_CHANGE_PROCESSOR_H_