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Before this patch, <input type=checkbox> and <input type=radio> can be
left in an active state if you press the spacebar down to toggle it, and
then press tab to move focus away before releasing the spacebar.

This patch calls SetActive(false) on the blur event for these input
types, which clears the active state in this case.

The test uses test_driver.Actions(), which isn't supported by the layout
test runner but works just fine in the separate wpt runner in the wpt
github repo.
I wrote the test and verified that it works well with the separate wpt
test runner, then wrote a TestExpectations line against the bug to track
the issue with the layout test runner: crbug.com/893480

Fixed: 1157510
Change-Id: I13a0900277dbfccc87ba81ffd684b12430665e10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2594107Reviewed-by: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837867}