Move the serial api and permission features to extensions/.

extensions/common/api/_permission_features.json

 // Copyright 2014 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/extensions.
 
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
@@ skipping 42 matching lines @@
   "power": {
     "channel": "stable",
     "extension_types": [ "extension", "legacy_packaged_app", "platform_app" ]
   },
   // Note: runtime is not actually a permission, but some systems check these
   // values to verify restrictions.
   "runtime": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"]
   },
+  "serial": {
+    "channel": "stable",
+    "extension_types": ["platform_app"]
+  },
   "socket": [
     {
       "channel": "stable",
       "extension_types": ["platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension"],
       "whitelist": [
         // The connectivity diagnostic utility is a component extension that is
@@ skipping 30 matching lines @@
     {
       "channel": "stable",
       "extension_types": ["extension"],
       "whitelist": [
         "496B6890097EB6E19809ADEADD095A8721FBB2E0",  // FIDO U2F APIs
         "E24F1786D842E91E74C27929B0B3715A4689A473"   // CryptoToken
       ]
     }
   ]
 }