Delete iSAC-fb from AudioCodingModule

Delete iSAC-fb from AudioCodingModule

This is no longer used. Related code in NetEq and the iSAC codec itself
will be deleted in follow-up CLs.

BUG=4210
Committed: https://crrev.com/9ea2147e5cbde3fd71a3c20353494a7e356ac98a
Cr-Commit-Position: refs/heads/master@{#10264}

[hlundin-webrtc, 2015-10-13 10:54:38]

Patchset #1 (id:1) has been deleted

[hlundin-webrtc, 2015-10-13 11:27:24]

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

[hlundin-webrtc, 2015-10-13 11:27:24]

🚮

[hlundin-webrtc, 2015-10-13 11:27:52]

The CQ bit was checked by henrik.lundin@webrtc.org to run a CQ dry run

[commit-bot: I haz the power, 2015-10-13 11:28:02]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1404623002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1404623002/20001

[kwiberg-webrtc, 2015-10-13 11:58:22]

lgtm

[commit-bot: I haz the power, 2015-10-13 12:13:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-13 12:13:50]

Dry run: This issue passed the CQ dry run.

[hlundin-webrtc, 2015-10-13 13:26:40]

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

[commit-bot: I haz the power, 2015-10-13 13:26:50]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1404623002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1404623002/20001

[commit-bot: I haz the power, 2015-10-13 13:28:01]

Committed patchset #1 (id:20001)

[commit-bot: I haz the power, 2015-10-13 13:28:16]

Patchset 1 (id:??) landed as
https://crrev.com/9ea2147e5cbde3fd71a3c20353494a7e356ac98a
Cr-Commit-Position: refs/heads/master@{#10264}