servo: Merge #17982 - style: Don't perform parent display-based style fixups on most pseudos (from heycam:parent-fixup); r=emilio

Reviewed by Emilio in https://bugzilla.mozilla.org/show_bug.cgi?id=1379865.

Source-Repo: https://github.com/servo/servo
Source-Revision: 586f84f5fea9a15c90dc5bc5415e2c5f5caa3ddb

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extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 2bc4a44859b0b32200c2816c0a4ffbfeb2eebcde