Fix segment fault issue bring by last cl https://codereview.chromium.…

…org/1857213004/

Fix segment fault issue related to launcher context menu.

BUG= 602918

Review URL: https://codereview.chromium.org/1888513002

Cr-Commit-Position: refs/heads/master@{#387013}

chrome/browser/ui/ash/launcher/launcher_context_menu.cc

@@ -202,7 +202,7 @@ bool LauncherContextMenu::ExecuteCommonCommand(int command_id,
     case MENU_AUTO_HIDE:
     case MENU_ALIGNMENT_MENU:
     case MENU_CHANGE_WALLPAPER:
-      ExecuteCommand(command_id, event_flags);
+      LauncherContextMenu::ExecuteCommand(command_id, event_flags);
       return true;
     default:
       return false;