Remove deprecated priority-less SequencedWorkerPool constructor.

chrome/browser/chromeos/arc/arc_process_service.cc

Index: chrome/browser/chromeos/arc/arc_process_service.cc
diff --git a/chrome/browser/chromeos/arc/arc_process_service.cc b/chrome/browser/chromeos/arc/arc_process_service.cc
index 78a203c3ef96ff2c98bb847985a5e8c06e68666b..e9f8b5250ea558e2d5d46f88ec85d79803b135e1 100644
--- a/chrome/browser/chromeos/arc/arc_process_service.cc
+++ b/chrome/browser/chromeos/arc/arc_process_service.cc
@@ -40,7 +40,9 @@ using std::vector;
 
 ArcProcessService::ArcProcessService(ArcBridgeService* bridge_service)
     : ArcService(bridge_service),
-      worker_pool_(new SequencedWorkerPool(1, "arc_process_manager")),
+      worker_pool_(new SequencedWorkerPool(1,
+                                           "arc_process_manager",
+                                           base::TaskPriority::USER_VISIBLE)),
       weak_ptr_factory_(this) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   arc_bridge_service()->process()->AddObserver(this);