Import wpt@3a8b4eba63e0e226cb9dc3648084753f920ffeb8

Using update-w3c-deps in Chromium 18d455ee833f6a30dcbe2755380861eb75cd9f6f.

Review-Url: https://codereview.chromium.org/2104293002
Cr-Commit-Position: refs/heads/master@{#403024}
9 files changed