henrik.lundin 5650a7d1c4 Improved readability and DCHECKing in AudioVector::[]
This is a follow-up to https://codereview.webrtc.org/2700633003, where
post-commit comments suggested these changes.

BUG=webrtc:7159

Review-Url: https://codereview.webrtc.org/2706263002
Cr-Commit-Position: refs/heads/master@{#16771}
2017-02-22 11:45:40 +00:00
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