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The setting does not seem to be documented, but was easily found by
tracking property changes to a device and playing around in settings.

This implementation keeps a suppression count and re-enables ambient
noise reduction, if it was initially enabled, once all streams
requesting this behavior have stopped.

Bug: chromium:789152
Change-Id: I1672a44bf185beedef2caaff8f66f5c50a9aad95
Reviewed-on: https://chromium-review.googlesource.com/737873
Commit-Queue: Oskar Sundbom <ossu@chromium.org>
Reviewed-by: Jason Chase <chasej@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520679}