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This is a precursor to defining ContentSettingsType via mojom. That change
will require more work as Clank depends on an Java definition of this type
that is auto-generated from content_settings_types.h.

Change-Id: Ieec565c6332528e6fc5112ad04c675d9b6137f1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885973Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Darin Fisher <darin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710684}