Remove use of deprecated MessageLoop methods in chrome/.

chrome/browser/chromeos/login/oobe_browsertest.cc

Index: chrome/browser/chromeos/login/oobe_browsertest.cc
diff --git a/chrome/browser/chromeos/login/oobe_browsertest.cc b/chrome/browser/chromeos/login/oobe_browsertest.cc
index 37ecce177af08a54551a982c80966e7ac5a5232f..fd2fb5495eb0ccffb9be415db2eac5952a169419 100644
--- a/chrome/browser/chromeos/login/oobe_browsertest.cc
+++ b/chrome/browser/chromeos/login/oobe_browsertest.cc
@@ -3,7 +3,10 @@
 // found in the LICENSE file.
 
 #include "base/command_line.h"
+#include "base/location.h"
 #include "base/macros.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/chromeos/login/existing_user_controller.h"
 #include "chrome/browser/chromeos/login/test/oobe_base_test.h"
@@ -43,8 +46,8 @@ class OobeTest : public OobeBaseTest {
   void TearDownOnMainThread() override {
     // If the login display is still showing, exit gracefully.
     if (LoginDisplayHost::default_host()) {
-      base::MessageLoop::current()->PostTask(FROM_HERE,
-                                             base::Bind(&chrome::AttemptExit));
+      base::ThreadTaskRunnerHandle::Get()->PostTask(
+          FROM_HERE, base::Bind(&chrome::AttemptExit));
       content::RunMessageLoop();
     }