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This reverts commit 51e98fac.

Reason for revert: New tests (MediaStreamConstraintsUtilAudioTest.ValidGeometry) are failing:
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.win%2FWin7_Tests__dbg__1_%2F60774%2F%2B%2Frecipes%2Fsteps%2Fcontent_unittests%2F0%2Flogs%2FMediaStreamConstraintsUtilAudioTest.ValidGeometry__x2f_0%2F0

Original change's description:
> SelectSettings algorithm for audio constraints.
> 
> This is intended to be used in getUserMedia to implement spec-compliant
> audio constraints processing.
> 
> BUG=657733
> 
> Change-Id: Ida1bc5561b16b0c5ac1628c19c71fb8f0b5a33fd
> Reviewed-on: https://chromium-review.googlesource.com/517782
> Commit-Queue: Guido Urdaneta <guidou@chromium.org>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Reviewed-by: Henrik Boström <hbos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#478607}

TBR=miu@chromium.org,hbos@chromium.org,guidou@chromium.org,jochen@chromium.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
BUG=657733

Change-Id: I9c9e9f6a9b0ad464c550443e273409feb4bd6ec7
Reviewed-on: https://chromium-review.googlesource.com/531126Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478643}