Simplify OWNERS structure in modules/audio_coding

Simplify OWNERS structure in modules/audio_coding

All ownership is now handled by the top-level OWNERS file in
modules/audio_coding.

NOTRY=True

Committed: https://crrev.com/c6891248b5eedf0194add1f46cabfb655338459b
Cr-Commit-Position: refs/heads/master@{#9512}

[hlundin-webrtc, 2015-06-29 10:46:44]

Patchset #1 (id:1) has been deleted

[hlundin-webrtc, 2015-06-29 10:48:30]

henrik.lundin@webrtc.org changed reviewers:
+ tina.legrand@webrtc.org

[hlundin-webrtc, 2015-06-29 10:49:02]

Updated the OWNERS files in audio_coding as discussed offline.

[tlegrand-webrtc, 2015-06-29 10:57:54]

lgtm

[hlundin-webrtc, 2015-06-29 11:53:51]

The CQ bit was checked by henrik.lundin@webrtc.org

[commit-bot: I haz the power, 2015-06-29 11:54:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1212133005/20001

[commit-bot: I haz the power, 2015-06-29 11:54:52]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-06-29 11:54:58]

Patchset 1 (id:??) landed as
https://crrev.com/c6891248b5eedf0194add1f46cabfb655338459b
Cr-Commit-Position: refs/heads/master@{#9512}