[Sync] ModelTypeStore factory shouldn't require valid PSS to function correctly

chrome/browser/sync/profile_sync_test_util.cc

Index: chrome/browser/sync/profile_sync_test_util.cc
diff --git a/chrome/browser/sync/profile_sync_test_util.cc b/chrome/browser/sync/profile_sync_test_util.cc
index c59b3c0a1c8c724319511c8ed8fd5a2d83a586f9..0b1886fd2ad4544ccb5533134bee8ecabb80a9c3 100644
--- a/chrome/browser/sync/profile_sync_test_util.cc
+++ b/chrome/browser/sync/profile_sync_test_util.cc
@@ -55,12 +55,6 @@ ProfileSyncService::InitParams CreateProfileSyncServiceParamsForTest(
   init_params.url_request_context = profile->GetRequestContext();
   init_params.debug_identifier = profile->GetDebugName();
   init_params.channel = chrome::GetChannel();
-  base::SequencedWorkerPool* blocking_pool =
-      content::BrowserThread::GetBlockingPool();
-  init_params.blocking_task_runner =
-      blocking_pool->GetSequencedTaskRunnerWithShutdownBehavior(
-          blocking_pool->GetSequenceToken(),
-          base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 
   return init_params;
 }