Enable chrome.mdns for Chrome Apps

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 706 matching lines @@
       "06BE211D5F014BAB34BC22D9DDA09C63A81D828E",  // Official XKB virtual kbd
       "CFBF7EE448FA48960FFDA7CEB30F7A21B26AA981",  // Official m17n virtual kbd
       "B9EF10DDFEA11EF77873CC5009809E5037FC4C7A",  // Google input tools
       "7D7A4B147FE39908A5AF13F85E38989C54BBE41C",  // http://crbug.com/374955
       "0EEDFC0EED87871237213F34EBC7B4982A195C95",  // http://crbug.com/374955
       "D2DAA9362153E8A5E3CF593E6DF4666421ABAD21",  // http://crbug.com/374965
       "D7986543275120831B39EF28D1327552FC343960",  // http://crbug.com/378067
       "A291B26E088FA6BA53FFD72F0916F06EBA7C585A"   // http://crbug.com/378067
     ]
   },
-  "mdns": {
+  "mdns": [{
     "channel": "stable",
-    "extension_types": ["extension", "platform_app"],
+    "extension_types": ["extension"],
     "whitelist": [
       "63ED55E43214C211F82122ED56407FF1A807F2A3",  // Dev
       "FA01E0B81978950F2BC5A50512FD769725F57510",  // Beta
       "B11A93E7E5B541F8010245EBDE2C74647D6C14B9",  // Canary
       "F155646B5D1CA545F7E1E4E20D573DFDD44C2540",  // Google Cast Beta
       "16CA7A47AAE4BE49B1E75A6B960C3875E945B264",  // Google Cast Stable
       "11B478CEC461C766A2DC1E5BEEB7970AE06DC9C2",  // http://crbug.com/397691
       "0EFB879311E9EFBB7C45251F89EC655711B1F6ED",  // http://crbug.com/397691
       "9193D3A51E2FE33B496CDA53EA330423166E7F02",  // http://crbug.com/397691
       "F9119B8B18C7C82B51E7BC6FF816B694F2EC3E89"   // http://crbug.com/397691
     ]
   },
+  {
+    "channel": "stable",
+    "extension_types": ["platform_app"], // Allow platform apps to access the

[not at google - send to devlin, 2014/11/17 23:22:15]

This line is self explanatory, no need to have a comment.

[Red Daly, 2014/11/19 21:31:50]

Done.

+                                         // API.
+    "whitelist": []

[not at google - send to devlin, 2014/11/17 23:22:15]

no "whitelist"

[Red Daly, 2014/11/19 21:31:50]

Done.

+  }],
   "musicManagerPrivate": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "whitelist": [
       "4B1D0E19C6C43C008C44A8278C8B5BFE15ABEB3C", // Music Manager
       "B8F61FD1B25DE03706DBB8906A73261E4DBB992A", // Test
       "F7FA7ABC1ECB89BA8EE6656847EFABBF43BB9BCA",
       "4FE45FA56EF6A25FDE8C302C44045CA9CE8A605A",
       "3D14248405B8A59043420AAC160077C99E7788A9",
       "A6C87307BBE5886CC5F1393025000E2FE8060BF2",
@@ skipping 300 matching lines @@
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "hosted_app"],
     "whitelist": [
       "B44D08FD98F1523ED5837D78D0A606EA9D6206E5",  // Web Store
       "2653F6F6C39BC6EEBD36A09AFB92A19782FF7EB4",  // Enterprise Web Store
       "2779FA8B45841D61A37207CCFAC9CB393964FE5B"   // Login Proxy (prototype)
     ]
   }
 }