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These tests had issues that have been fixed in WPT so they now pass:
* contain-layout-cell-001 and contain-layout-cell-002 fixed by
  https://github.com/web-platform-tests/wpt/pull/12926
* contain-size-025 fixed by
  https://github.com/web-platform-tests/wpt/pull/12960
* contain-layout-formatting-context-margin-001.html fixed by
  https://bugzilla.mozilla.org/show_bug.cgi?id=1490111

Change-Id: I238fd8df20a99536d65815061e10b32b0d59f21f
Reviewed-on: https://chromium-review.googlesource.com/1226591
Commit-Queue: Emil A Eklund <eae@chromium.org>
Reviewed-by: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591296}