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FWIW: I tried using capturing (true as third arg to addEventListener)
and stopPropagation()/e.defaultPrevented. Because keypress seems to
be handled before click, it didn't make a difference. So I landed at
target filtering. This has the benefit of never navigating for
elements we don't add to this list, but with the detriment of needing
to explicitly add any new UI elements.

R=mahmadi@chromium.org

Fixed: 1012996
Change-Id: Ie36a90210eee8238d05d026bf370a8bc95160a2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1851228Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Dan Beam <dbeam@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704477}