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Currently we do not support device switching for Cast sessions via the
audio device selector in the zenith dialog. As such, the audio device
selector view should not be added to cast zenith notifications.

In order to distinguish cast notifications from local ones, a method was
added to the MediaNotificationItem base class.

Bug: 1104270
Change-Id: I16d57849b4370e6313c3cc8b4733d97d79af177f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321050
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Reviewed-by: Tommy Steimel <steimel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795316}