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This CL converts AssistantSettingsManager from settings.mojom to
new Mojo types using  Remote, ReceiverSet, and PendingReceiver.

Bug: 955171
Change-Id: I87dac56b4e0fb8f13c3e2c39785418619a7eabfd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1871999Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#709365}