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These are now being build on the official builders, so it probably makes
sense to enable by default.

Bug: 1033098
Change-Id: I04224c174ac3de526cadd26f05fe34fdd77d2ac1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145821
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758873}