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Previous code rerouted accessibility focus reporting when any menu item
or list item was focused/selected, and the current menu depth > 0.
However, the menu depth calculation has shown to easily break.

Since the focus override is only necessary for autofill menus, this CL
changes the focus override so that it is is only turned on when needed
by a popup that is overriding focus in the web page.

Bug: 1039422
Change-Id: I49bd0db88bd945a6fc7be3309701d394670d7099
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2247039
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779433}