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This changes the permission string for the Font Access API so that it
succinctly explains the use-case for the API to the end-user.

The string is not ideal, because at best, it does not guarantee that the
API will be used for that purpose, and at worst, it is lying (e.g. one
may use the API for other legitimate purposes).

That said, that's the compromise we've landed on to test this API with
users.

Bug: 1043306
Change-Id: I30b31bcae8a39f942021ef87f88a53ed3453d3a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437090
Commit-Queue: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811744}