Setting audio volume is no longer ignored on low latency audio path for Mac.
Setting audio volume is no longer ignored on low latency audio path for Mac.

Note that Mac is (was) the only platform that did not use the volume level for the low-latency output path. This discrepancy is now removed.

This change should not affect the audio/video tag or any other audio client as far as I can tell.

TBR=dalecurtis
BUG=166394
TEST=Run this https://code.google.com/p/webrtc-samples/source/browse/trunk/demos/html/local-audio-rendering.html on Mac and verify that volume settings works.

Also executed: media_unittests

Review URL: https://codereview.chromium.org/11591013

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@173452 0039d316-1c4b-4281-b951-d872f2087c98

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