Removing AudioCoding class, a.k.a the new ACM API

Removing AudioCoding class, a.k.a the new ACM API

We have decided not to do a switch from old (AudioCodingModule) to new
(AudioCoding) API. Instead, we will gradually evolve the old API to
meet the new design goals.

As a consequence of this decision, the AudioCoding and AudioCodingImpl
classes are deleted. Also removing associated unit test sources. No
test coverage is lost with this operation, since the tests for the
"old" API are testing more than the deleted tests did.

BUG=webrtc:3520
Committed: https://crrev.com/e9eca8f5ae60116a2351634575faf4cd5e338e61
Cr-Commit-Position: refs/heads/master@{#10406}

[hlundin-webrtc, 2015-10-21 14:03:27]

henrik.lundin@webrtc.org changed reviewers:
+ kwiberg@webrtc.org

[hlundin-webrtc, 2015-10-21 14:03:27]

Karl, PTAL.

[kwiberg-webrtc, 2015-10-26 10:48:30]

lgtm

💥

[hlundin-webrtc, 2015-10-26 10:49:51]

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

[commit-bot: I haz the power, 2015-10-26 10:50:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1415163002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1415163002/1

[commit-bot: I haz the power, 2015-10-26 12:26:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-26 12:26:55]

Patchset 1 (id:??) landed as
https://crrev.com/e9eca8f5ae60116a2351634575faf4cd5e338e61
Cr-Commit-Position: refs/heads/master@{#10406}