Remove calls to deprecated MessageLoop methods in chrome.

chrome/browser/media_galleries/media_galleries_permissions_unittest.cc

Index: chrome/browser/media_galleries/media_galleries_permissions_unittest.cc
diff --git a/chrome/browser/media_galleries/media_galleries_permissions_unittest.cc b/chrome/browser/media_galleries/media_galleries_permissions_unittest.cc
index 6904f593d6ee89270a7b48b4e5d55a2a0cd5e0e4..78180c1c185781ef94eccc07cd194b8cbf1c340c 100644
--- a/chrome/browser/media_galleries/media_galleries_permissions_unittest.cc
+++ b/chrome/browser/media_galleries/media_galleries_permissions_unittest.cc
@@ -54,7 +54,7 @@ class MediaGalleriesPermissionsTest : public extensions::ExtensionPrefsTest {
     gallery_prefs_->SetExtensionPrefsForTesting(prefs());
     Verify();
     prefs_.pref_service()->CommitPendingWrite();
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
 
     storage_monitor::TestStorageMonitor::Destroy();