solenberg 418b7d34d1 Increase number of unsignaled audio streams we handle to 4.
BUG=webrtc:7179 b/34746131

Review-Url: https://codereview.webrtc.org/2900713002
Cr-Commit-Position: refs/heads/master@{#18551}
2017-06-13 07:38:27 +00:00
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