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This matches the permissions used by the old mime_types API that the new API replaces.

Bug: 819761
Change-Id: I7b9cb7150762d54a375bf1fa69cd10d4b715dfb0
Reviewed-on: https://chromium-review.googlesource.com/1007636Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550406}