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These attributes have been removed from the spec, or were never standard
in the first place, and have zero usage.

"Intent to remove" thread:
https://groups.google.com/a/chromium.org/forum/#!topic/Blink-dev/kGS73zpPT0I

Bug: 696669
Change-Id: Id999ab29c2a93fc7c36079196a8a924c01450066
Reviewed-on: https://chromium-review.googlesource.com/1110221
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570004}