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As part of the resolution from
https://github.com/WICG/display-locking/issues/139

we decided that we should use the contained size information when
determining what to scroll into view. In the code, this means we
shouldn't activate the element on scrollIntoView and rely on viewport
intersection instead. Note that hidden-matchable now (correctly) doesn't
unhide.

R=chrishtr@chromium.org

Change-Id: I9336868ddace68b85e6da4b99ad02ad2f9aa1314
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109815Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: vmpstr <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752068}