[Sync] Switch ModelTypeStore* from blocking pool to post_task.h

components/sync/model/model_type_store.cc

 // 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.
 
 #include "components/sync/model/model_type_store.h"
 
 #include "base/memory/ptr_util.h"
 #include "components/sync/model_impl/accumulating_metadata_change_list.h"
 #include "components/sync/model_impl/model_type_store_impl.h"
 #include "components/sync/model_impl/passthrough_metadata_change_list.h"
 
 namespace syncer {
 
 // static
 void ModelTypeStore::CreateInMemoryStoreForTest(ModelType type,
                                                 const InitCallback& callback) {
   ModelTypeStoreImpl::CreateInMemoryStoreForTest(type, callback);
 }
 
 // static
 void ModelTypeStore::CreateStore(
     ModelType type,
     const std::string& path,
-    scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
     const InitCallback& callback) {
-  ModelTypeStoreImpl::CreateStore(type, path, blocking_task_runner, callback);
+  ModelTypeStoreImpl::CreateStore(type, path, callback);
 }
 
 ModelTypeStore::~ModelTypeStore() {}
 
 // static
 std::unique_ptr<MetadataChangeList>
 ModelTypeStore::WriteBatch::CreateMetadataChangeList() {
   return base::MakeUnique<AccumulatingMetadataChangeList>();
 }
 
@@ skipping 18 matching lines @@
   return metadata_change_list_.get();
 }
 
 void ModelTypeStore::WriteBatch::TransferMetadataChanges(
     std::unique_ptr<MetadataChangeList> mcl) {
   static_cast<AccumulatingMetadataChangeList*>(mcl.get())->TransferChanges(
       store_, this);
 }
 
 }  // namespace syncer