Pass blocking pool runner to CreateTemporaryFile in SyncFS v2 drive_backend

chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc

Index: chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc b/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc
index 6e614e61f97a61dfe2970f79f179b438cf61be89..8a2eab761cbfb9e13607071807798e06d0213bf3 100644
--- a/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc
+++ b/chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.cc
@@ -578,7 +578,8 @@ void RemoteToLocalSyncer::DeleteLocalFile(const SyncStatusCallback& callback) {
 void RemoteToLocalSyncer::DownloadFile(const SyncStatusCallback& callback) {
   base::PostTaskAndReplyWithResult(
       sync_context_->GetBlockingTaskRunner(), FROM_HERE,
-      base::Bind(&sync_file_system::drive_backend::CreateTemporaryFile),
+      base::Bind(&sync_file_system::drive_backend::CreateTemporaryFile,
+                 make_scoped_refptr(sync_context_->GetBlockingTaskRunner())),
       base::Bind(&RemoteToLocalSyncer::DidCreateTemporaryFileForDownload,
                  weak_ptr_factory_.GetWeakPtr(), callback));
 }