Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc

Index: chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc b/chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc
index f735ce8fdc1d6a57865208859683150cc5738660..434c70f5523351ef347d981315b3a88d61425111 100644
--- a/chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc
+++ b/chrome/browser/ui/webui/chromeos/login/l10n_util_unittest.cc
@@ -12,6 +12,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/memory/singleton.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/customization/customization_document.h"
@@ -39,7 +40,7 @@ MachineStatisticsInitializer::MachineStatisticsInitializer() {
   base::MessageLoop loop;
   chromeos::system::StatisticsProvider::GetInstance()
       ->StartLoadingMachineStatistics(loop.task_runner(), false);
-  loop.RunUntilIdle();
+  base::RunLoop().RunUntilIdle();
 }
 
 // static