Don't try to record histogram when showing context menu submenus

Submenus don't have command IDs AFAICT, so this will always fail.

Bug: None
Change-Id: I5bc7c4292c02f515fd11594b69871d2cbf342627
Reviewed-on: https://chromium-review.googlesource.com/1195829Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587572}

components/renderer_context_menu/render_view_context_menu_base.cc

@@ -361,7 +361,8 @@ void RenderViewContextMenuBase::ExecuteCommand(int id, int event_flags) {
 void RenderViewContextMenuBase::MenuWillShow(ui::SimpleMenuModel* source) {
   for (int i = 0; i < source->GetItemCount(); ++i) {
     if (source->IsVisibleAt(i) &&
-        source->GetTypeAt(i) != ui::MenuModel::TYPE_SEPARATOR) {
+        source->GetTypeAt(i) != ui::MenuModel::TYPE_SEPARATOR &&
+        source->GetTypeAt(i) != ui::MenuModel::TYPE_SUBMENU) {
       RecordShownItem(source->GetCommandIdAt(i));
     }
   }