ppapi: AudioEncode: drop Speex codec

ppapi: AudioEncode: drop Speex codec

Speex was removed from the chromium third party dependencies. Since Opus was
designed as a replacement for Speex, let's just drop Speex from the pepper
api.

BUG=461222
Committed: https://crrev.com/e982d804c531dd3f628de3f75e96db92b93ab7a8
Cr-Commit-Position: refs/heads/master@{#349658}

[llandwerlin-old, 2015-09-18 09:46:55]

lionel.g.landwerlin@intel.com changed reviewers:
+ bbudge@chromium.org

[llandwerlin-old, 2015-09-18 09:46:55]

bbudge@: PTAL, thanks.

[bbudge, 2015-09-18 13:20:25]

lgtm

[llandwerlin-old, 2015-09-18 13:21:44]

The CQ bit was checked by lionel.g.landwerlin@intel.com

[commit-bot: I haz the power, 2015-09-18 13:22:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1351323002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1351323002/1

[commit-bot: I haz the power, 2015-09-18 13:33:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-18 13:34:29]

Patchset 1 (id:??) landed as
https://crrev.com/e982d804c531dd3f628de3f75e96db92b93ab7a8
Cr-Commit-Position: refs/heads/master@{#349658}