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We can just set an override containing block height to ensure that
percentages resolve to auto, as desired.

This resolved a long-standing bug we had and improves compat with
Firefox.

Bug: 998080
Change-Id: I43510e69f360c32d2739d9514a659ca517ccfd7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1786297
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Auto-Submit: Christian Biesinger <cbiesinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694313}