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Convert the implementation and all users of the
ash::mojom::AssistantVolumeControl and VolumeObserver interfaces.

Bug: 955171
Change-Id: Id4fd8931ecc2d29eaff0b25defb909bf0f491aca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1795422Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#696007}