[Sync] Add ProfileSyncService::GetModelTypeStoreFactory.

ios/chrome/browser/sync/ios_chrome_profile_sync_test_util.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 "ios/chrome/browser/sync/ios_chrome_profile_sync_test_util.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "components/browser_sync/profile_sync_service_mock.h"
 #include "components/browser_sync/profile_sync_test_util.h"
@@ skipping 20 matching lines @@
   init_params.start_behavior = browser_sync::ProfileSyncService::MANUAL_START;
   init_params.sync_client =
       sync_client ? std::move(sync_client)
                   : base::MakeUnique<IOSChromeSyncClient>(browser_state);
   init_params.network_time_update_callback =
       base::Bind(&browser_sync::EmptyNetworkTimeUpdate);
   init_params.base_directory = browser_state->GetStatePath();
   init_params.url_request_context = browser_state->GetRequestContext();
   init_params.debug_identifier = browser_state->GetDebugName();
   init_params.channel = ::GetChannel();
-  init_params.blocking_pool = web::WebThread::GetBlockingPool();
+  base::SequencedWorkerPool* blocking_pool = web::WebThread::GetBlockingPool();
+  init_params.blocking_task_runner =
+      blocking_pool->GetSequencedTaskRunnerWithShutdownBehavior(
+          blocking_pool->GetSequenceToken(),
+          base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 
   return init_params;
 }
 
 std::unique_ptr<KeyedService> BuildMockProfileSyncService(
     web::BrowserState* context) {
   return base::MakeUnique<browser_sync::ProfileSyncServiceMock>(
       CreateProfileSyncServiceParamsForTest(
           nullptr, ios::ChromeBrowserState::FromBrowserState(context)));
 }