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Also simplify the model, and fix an issue where :focus-visible didn't match if `preventDefault()` was called on the keyboard event.

Now the model is that any trusted keyboard event will set had_keyboard_event to true, and any focus from mouse will re-set it to false.

Bug: 1010549
Change-Id: Ifcb9bfbef746b91d99fc8ef42a8ef0e223fca2c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863061Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Alice Boxhall <aboxhall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707709}