Fix mouse clicks on context menu item returning as sourced from

keyboard.

Bug: 1288609, b:215187079
Change-Id: I3239af873914c1ecee7dfd5e2684586c68f0c6f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3400179


Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Juan Mojica <juanmojica@google.com>
Cr-Commit-Position: refs/heads/main@{#961031}