Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/extensions/menu_manager_unittest.cc

Index: chrome/browser/extensions/menu_manager_unittest.cc
diff --git a/chrome/browser/extensions/menu_manager_unittest.cc b/chrome/browser/extensions/menu_manager_unittest.cc
index ad19e24ab84987d88fb8906e553a3c2e6b41f593..0b75ab6a0c4f7ede879ec7dd5442e9e5bd07e72b 100644
--- a/chrome/browser/extensions/menu_manager_unittest.cc
+++ b/chrome/browser/extensions/menu_manager_unittest.cc
@@ -11,6 +11,7 @@
 #include "base/json/json_reader.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -59,7 +60,7 @@ class MenuManagerTest : public testing::Test {
 
   void TearDown() override {
     prefs_.pref_service()->CommitPendingWrite();
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   // Returns a test item.