Add channel_count parameter back to AudioBuffer creation methods.

Add channel_count parameter back to AudioBuffer creation methods.

This fixes a bug where we failed to set the proper channel count on
AudioBuffers with the CHANNEL_LAYOUT_DISCRETE channel layout.

BUG=357801
R=dalecurtis@chromium.org
TBR=dmichael

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=260333

[rileya (GONE FROM CHROMIUM), 2014-03-28 22:55:27]

Should fix the Mac crashes. PTAL.

[rileya (GONE FROM CHROMIUM), 2014-03-28 22:56:27]

+dmichael for OWNER review of
content/renderer/pepper/content_decryptor_delegate.cc

[DaleCurtis, 2014-03-28 23:07:01]

lgtm

[scherkus (not reviewing), 2014-03-28 23:16:56]

FYI you can usually TBR OWNERS of files affected by trivial API changes that the
OWNER for said API approved:
http://dev.chromium.org/developers/owners-files

(in this case, dalecurtis@'s l-g-t-m on media/ stuff means you can typically TBR
affected OWNERS)

[rileya (GONE FROM CHROMIUM), 2014-03-28 23:21:30]

Good point, TBR-ing dmichael.

[rileya (GONE FROM CHROMIUM), 2014-03-28 23:21:35]

The CQ bit was checked by rileya@chromium.org

[commit-bot: I haz the power, 2014-03-28 23:23:22]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rileya@chromium.org/212103013/20001

[commit-bot: I haz the power, 2014-03-29 01:03:39]

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

[commit-bot: I haz the power, 2014-03-29 01:03:39]

Try jobs failed on following builders:
  tryserver.chromium on linux_chromium_chromeos_rel

[rileya (GONE FROM CHROMIUM), 2014-03-29 01:07:03]

The CQ bit was checked by rileya@chromium.org

[commit-bot: I haz the power, 2014-03-29 01:08:14]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rileya@chromium.org/212103013/20001

[DaleCurtis, 2014-03-29 01:33:03]

Committed patchset #2 manually as r260333 (presubmit successful).

[dmichael(do not use this one), 2014-03-31 17:46:04]

(late pepper lgtm)