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CastAudioManager should only be used on platforms that use ALSA.

BUG=internal 35197382
TEST=internal CQ

Change-Id: I259dc5a5798c5a7144641a09ae6aede18125c0a6
Reviewed-on: https://chromium-review.googlesource.com/565625
Commit-Queue: Jenny Wong <jyw@chromium.org>
Reviewed-by: Alok Priyadarshi <alokp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486872}