Don't try to open action bar overflow menus from bogus events

Some monkey tests could hit a case where a posted overflow button
click event was still lingering after the menu was no longer in a
created state, which could lead apps to crash. Just drop open-overflow
requests on the floor if the menu is in a weird state when we try.

Bug 7242431

Change-Id: Ieebb1fccfeeccbf17fd7c6cff06efbcb19b11ce3