Add whitelist for the chrome.syncedNotificationsPrivate API.

Add whitelist for the chrome.syncedNotificationsPrivate API.

Additionally, promotes the API to dev channel since it is appropriately
restricted.

BUG=400436
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=288109

[dewittj, 2014-08-04 22:05:54]

ptal, thanks

[not at google - send to devlin, 2014-08-04 22:08:05]

lgtm

https://codereview.chromium.org/439393003/diff/1/chrome/common/extensions/api...
File chrome/common/extensions/api/_permission_features.json (right):

https://codereview.chromium.org/439393003/diff/1/chrome/common/extensions/api...
chrome/common/extensions/api/_permission_features.json:963:
"34967F9FA3C399E1EC380B443D7331AA93AC445B"  // http://crbug.com/400436
indent -= 2

[dewittj, 2014-08-05 17:05:48]

The CQ bit was checked by dewittj@chromium.org

[commit-bot: I haz the power, 2014-08-05 17:06:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dewittj@chromium.org/439393003/20001

[commit-bot: I haz the power, 2014-08-05 21:05:18]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[commit-bot: I haz the power, 2014-08-05 22:31:34]

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

[commit-bot: I haz the power, 2014-08-05 22:31:35]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_swarming on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[dewittj, 2014-08-07 17:12:00]

The CQ bit was checked by dewittj@chromium.org

[commit-bot: I haz the power, 2014-08-07 17:12:57]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/dewittj@chromium.org/439393003/20001

[commit-bot: I haz the power, 2014-08-07 19:31:13]

Change committed as 288109