style: Remove serialize_basicshape_position.
style: Remove serialize_basicshape_position.

Per https://github.com/w3c/csswg-drafts/issues/2274. There's a whole lot of new failures, but those need to be updated along with the spec changes in that issue.

We did resolve that position serialized the same everywhere though.

Differential Revision: https://phabricator.services.mozilla.com/D1933

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