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This is a reland of f300ac05

The original change added a method to a mojom interface but neglected to
implemnet this method for a class in ChromeOS. This reland adds the
missing implementation that caused builds to fail.

Original change's description:
> GMC: Add IPC for switching the audio output device
>
> This change adds methods used by the global media controls ui for
> switching the audio output device used by a page.
>
> MediaController::SetAudioSinkId was created allowing the
> MediaNotificationService to route the audio output of a
> MediaNotificationSession to a specified audio device.
>
> Mojo interfaces were expanded to allow for this IPC between the
> controller and session.
>
> Bug: 1096243
> Change-Id: Icd0ad17d6ef88ec297444b8b2cbc7ddda6c2c4c9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295799
> Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
> Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
> Reviewed-by: Sean Topping <seantopping@chromium.org>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Becca Hughes <beccahughes@chromium.org>
> Reviewed-by: Tommy Steimel <steimel@chromium.org>
> Auto-Submit: Noah Rose Ledesma <noahrose@google.com>
> Cr-Commit-Position: refs/heads/master@{#792935}

Bug: 1096243
Change-Id: I0dad44fc7d1c8daac50519e8625a3cc2150fa34c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2328034Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Yue Li <updowndota@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Cr-Commit-Position: refs/heads/master@{#794619}