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Brings Chrome's implementation inline with the latest spec changes.

Bug: 819744
Change-Id: I716bab14bdbcc1c452a4dd447adbe28ffef05f98
Reviewed-on: https://chromium-review.googlesource.com/953259
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541739}