Replace "nested message loop" with "nested run loop" in comments.

extensions/test/result_catcher.h

Index: extensions/test/result_catcher.h
diff --git a/extensions/test/result_catcher.h b/extensions/test/result_catcher.h
index b03b031eb4d7633787cfe35bdee58595b1c7328c..1d585f28071b8fd1105d93b6adf9d8685a96d00d 100644
--- a/extensions/test/result_catcher.h
+++ b/extensions/test/result_catcher.h
@@ -57,7 +57,7 @@ class ResultCatcher : public content::NotificationObserver {
   // If non-NULL, we will listen to events from this BrowserContext only.
   content::BrowserContext* browser_context_restriction_;
 
-  // Only set if we're in a nested message loop waiting for results from
+  // Only set if we're in a nested run loop waiting for results from
   // the extension.
   base::Closure quit_closure_;
 };