Remove use of deprecated MessageLoop methods in ui.

ui/base/models/simple_menu_model.cc

Index: ui/base/models/simple_menu_model.cc
diff --git a/ui/base/models/simple_menu_model.cc b/ui/base/models/simple_menu_model.cc
index 3fd26fa683bead0e92d92744c1f78a8047742508..b466051fcde7f3fd4e19df558fd17e327db5ac68 100644
--- a/ui/base/models/simple_menu_model.cc
+++ b/ui/base/models/simple_menu_model.cc
@@ -7,7 +7,9 @@
 #include <stddef.h>
 
 #include "base/bind.h"
-#include "base/message_loop/message_loop.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/image/image.h"
 
@@ -393,7 +395,7 @@ void SimpleMenuModel::MenuClosed() {
   // Due to how menus work on the different platforms, ActivatedAt will be
   // called after this.  It's more convenient for the delegate to be called
   // afterwards though, so post a task.
-  base::MessageLoop::current()->PostTask(
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&SimpleMenuModel::OnMenuClosed, method_factory_.GetWeakPtr()));
 }