Re: Update mozilla CSS reftests as of 2017-04-20 (#5621)

Reviewed 2 of 2 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved, some commit checks pending.

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*Comments from [Reviewable](https://reviewable.io:443/reviews/w3c/web-platform-tests/5621)*
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View on GitHub: https://github.com/w3c/web-platform-tests/pull/5621#issuecomment-295734735

Received on Thursday, 20 April 2017 13:17:24 UTC