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This patch removes unlocking for activation. This is instead replaced
with scrolling the element into view for the auto case.

Find-in-page still activates, since it needs further testing and because
it needs to work with hidden-matchable as well as auto.

R=chrishtr@chromium.org, aleventhal@chromium.org

Change-Id: Ice3e488281da6e55bac1451c596e648aaa2b440f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2130680
Commit-Queue: vmpstr <vmpstr@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755379}