Allow gcdPrivate on any channel.

chrome/common/extensions/api/_permission_features.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
@@ skipping 469 matching lines @@
     "channel": "stable",
     "extension_types": ["platform_app"],
     "location": "component",
     "platforms": ["chromeos"]
   },
   "fontSettings": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "gcdPrivate": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["extension", "platform_app"],
     "whitelist": [
       "11B478CEC461C766A2DC1E5BEEB7970AE06DC9C2",  // http://crbug.com/394124
       "0EFB879311E9EFBB7C45251F89EC655711B1F6ED",  // http://crbug.com/394124
       "9193D3A51E2FE33B496CDA53EA330423166E7F02",  // http://crbug.com/394124
       "F9119B8B18C7C82B51E7BC6FF816B694F2EC3E89"   // http://crbug.com/394124
     ]
   },
   "gcm": {
     "channel": "stable",
@@ skipping 564 matching lines @@
   },
   "webRequest": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   }
 }