Niels Möller 0240bcc1f3 Make NetEqController::TargetLevelMs method const
This method is used by GetStats, and hence must not modify any state.

This cl is step one of the api change, the non-const version of the
method can be deleted once downstream implementations of this
interface are updated.

Bug: webrtc:11622
Change-Id: Icfaccee6bc918ac5c8a39dd2567a1081e342e9e8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/183881
Reviewed-by: Ivo Creusen <ivoc@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32072}
2020-09-10 15:50:46 +00:00
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