ui: Use base::MessageLoop.

ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm

Index: ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm
diff --git a/ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm b/ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm
index c76a926668cf90ee74c8b32a691c7be9a8bd97ca..e5763ba7f308b91c65bdd1faeb974d01de2582b8 100644
--- a/ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm
+++ b/ui/app_list/cocoa/test/apps_grid_controller_test_helper.mm
@@ -100,13 +100,13 @@ size_t AppsGridControllerTestHelper::GetPageIndexForItem(int item_id) const {
 }
 
 void AppsGridControllerTestHelper::DelayForCollectionView() {
-  message_loop_.PostDelayedTask(FROM_HERE, MessageLoop::QuitClosure(),
+  message_loop_.PostDelayedTask(FROM_HERE, base::MessageLoop::QuitClosure(),
                                 base::TimeDelta::FromMilliseconds(100));
   message_loop_.Run();
 }
 
 void AppsGridControllerTestHelper::SinkEvents() {
-  message_loop_.PostTask(FROM_HERE, MessageLoop::QuitClosure());
+  message_loop_.PostTask(FROM_HERE, base::MessageLoop::QuitClosure());
   message_loop_.Run();
 }