Auto merge of #25291 - servo-wpt-sync:wpt_update_14-12-2019, r=jdm

Sync WPT with upstream (14-12-2019)

Automated downstream sync of changes from upstream as of 14-12-2019.
[no-wpt-sync]
r? @servo-wpt-sync
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bors-servo 2019-12-14 18:07:34 -05:00 committed by GitHub
commit 2a54d41295
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76 changed files with 3423 additions and 6503 deletions

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