Remove gcdPrivate API code.

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 chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and feature_provider.h.
 
 // If you add a new platform_app permission please update the "stubs_app" test:
@@ skipping 396 matching lines @@
   "firstRunPrivate": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "location": "component",
     "platforms": ["chromeos"]
   },
   "fontSettings": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
-  "gcdPrivate": {
-    "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",
     "extension_types": ["extension", "platform_app"]
   },
   "geolocation": {
     "channel": "stable",
     "extension_types": [
       "extension", "legacy_packaged_app", "hosted_app", "platform_app"
     ]
   },
@@ skipping 490 matching lines @@
     "channel": "stable",
     "extension_types": ["platform_app"],
     "platforms": ["chromeos"],
     "whitelist": [
       "A948368FC53BE437A55FEB414106E207925482F5",  // Files app
       "8C726564C6DBE7380BAB388DE6CC7EC93EB44B06",  // Video player
       "5065C83E84321221675D20FBE4DC43C655CC8C6F"   // Files app tests
     ]
   }
 }