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

chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm
index 21481ef356a920f35c7f30ce0f33db66208d128e..d4361db54c5cfe4f02855821bca8c03133ed321a 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_drag_drop_cocoa.mm
@@ -55,7 +55,7 @@ void DragBookmarks(Profile* profile,
                    ui::DragDropTypes::DragEventSource source) {
   DCHECK(!nodes.empty());
 
-  // Allow nested message loop so we get DnD events as we drag this around.
+  // Allow nested run loop so we get DnD events as we drag this around.
   base::MessageLoop::ScopedNestableTaskAllower nestable_task_allower(
       base::MessageLoop::current());