We had a couple bugs when using the review menu on mobile.
The first has to do with the event overlay that we add to the page when the

review menu opens. The overlay wasn't going away when closing the menu by

tapping somewhere else on the unified banner (i.e. tapping the mode selector,

publish buttons or empty space). And, if you opened the review menu again, a

new overlay would be added, and the overlays would keep stacking if you

repeated this.
This is fixed by listening to the closing event on the menu and removing

the overlay that way. Previously, we subclasses the closeMenu()

method that exists on the parent Actions.MenuActionView and put the

overlay removal logic in there. However that method doesn't actually

always get called when the menu closes. The grandparent Ink MenuView

sometimes closes the menu directly through its close() method. We may

want to remove or rework these Actions.MenuActionView.openMenu() and

closeMenu() methods in the future, since it could lead to unexpected

state leftover like it did here.
Secondly, the contents of the menu would get cut off when viewing on

mobile. This change makes things look much better by forcing the menu

contents to take up the entire width of the screen and wrap any text

in it.

Tested opening, closing, and selecting items in the review menu in

  mobile and desktop.
Tested exiting the review menu by it and a lot of other places.
Tested scrolling with the menu open.
Ran JS unit tests.