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So that we don't have to be capable of creating one ourselves, which requires a dependency on the audio decoders. BUG=webrtc:6000, webrtc:8396 Change-Id: Ibb6b3f36f14b956c55d4edc934d101cb855b272d Reviewed-on: https://webrtc-review.googlesource.com/18420 Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Reviewed-by: Oskar Sundbom <ossu@webrtc.org> Commit-Queue: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20622}