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This is already enabled by default in source, but
this updates the JSON to match the Finch config.

Bug: 881930
Change-Id: I26f637447141730e24f0a2e2c4d84b05f2cba2fa
Reviewed-on: https://chromium-review.googlesource.com/c/1278621Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ryan Sleevi <rsleevi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599837}