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Ash runs in the browser process and directly uses pref objects. Since
it doesn't use the mojo preferences service, remove the capability
references.

Bug: none
Change-Id: If15c14020c33dcbb5c01b463b842df7a885c3c74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1648537Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ken Rockot <rockot@google.com>
Auto-Submit: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#667152}