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Add the ability to the audio API to activate more than one audio device at a
time. This is currently accomplished via a hack and when getting device info
via audio.getInfo, only one device will show up as active.

This will allow us to active multiple microphones and multiple speakers though.

I've also made couple of changes to OWNERS files so we don't need to keep
chasing rubberstamps for audio changes.

This is patched from rkc@'s original cl:
https://codereview.chromium.org/460113003/

BUG=397664

TBR=asargent

Review URL: https://codereview.chromium.org/478493002

Cr-Commit-Position: refs/heads/master@{#289951}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289951 0039d316-1c4b-4281-b951-d872f2087c98