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recent versions of the spec do not support 'auto' value.
so before retire that value, we should check how many use it.

Bug: 831550
Change-Id: I3b551ea759d05cade1e8823f3dc1c68f30b65816
Reviewed-on: https://chromium-review.googlesource.com/1007294
Commit-Queue: Hwanseung Lee <hwanseung@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550166}