Change to address default selection of menu item

ui/views/controls/menu/menu_runner.cc

Index: ui/views/controls/menu/menu_runner.cc
diff --git a/ui/views/controls/menu/menu_runner.cc b/ui/views/controls/menu/menu_runner.cc
index e53f2f205439f9b6d3860c821a603021015ca195..386f090b7179b8b549a4daf66fe9825fe6f17b2f 100644
--- a/ui/views/controls/menu/menu_runner.cc
+++ b/ui/views/controls/menu/menu_runner.cc
@@ -159,9 +159,12 @@ MenuRunner::RunResult MenuRunnerImpl::RunMenuAt(
   }
   running_ = true;
   for_drop_ = (types & MenuRunner::FOR_DROP) != 0;
+  bool root_context_menu = (MenuRunner::CONTEXT_MENU ==
+                  (types & (MenuRunner::IS_NESTED | MenuRunner::CONTEXT_MENU)));
   bool has_mnemonics = (types & MenuRunner::HAS_MNEMONICS) != 0 && !for_drop_;
   menu_->PrepareForRun(has_mnemonics,
-                       !for_drop_ && ShouldShowMnemonics(button));
+                       !for_drop_ && ShouldShowMnemonics(button),
+                       root_context_menu);
   int mouse_event_flags = 0;
   owns_controller_ = false;
   if (!controller) {