[Sync] Convert DTCs to be not RefCounted and NonThreadSafe.

components/sync/driver/fake_generic_change_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/driver/fake_generic_change_processor.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 57 matching lines @@
 FakeGenericChangeProcessorFactory::FakeGenericChangeProcessorFactory(
     std::unique_ptr<FakeGenericChangeProcessor> processor)
     : processor_(std::move(processor)) {}
 
 FakeGenericChangeProcessorFactory::~FakeGenericChangeProcessorFactory() {}
 
 std::unique_ptr<GenericChangeProcessor>
 FakeGenericChangeProcessorFactory::CreateGenericChangeProcessor(
     syncer::ModelType type,
     syncer::UserShare* user_share,
-    syncer::DataTypeErrorHandler* error_handler,
+    std::unique_ptr<syncer::DataTypeErrorHandler> error_handler,
     const base::WeakPtr<syncer::SyncableService>& local_service,
     const base::WeakPtr<syncer::SyncMergeResult>& merge_result,
     SyncClient* sync_client) {
   return std::move(processor_);
 }
 
 }  // namespace sync_driver