Whitelist extension APIs from md-settings in settings

chrome/common/extensions/api/_api_features.json

 // Copyright 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 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.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 530 matching lines @@
     "dependencies": ["permission:input"],
     "contexts": ["blessed_extension"]
   },
   "inputMethodPrivate": [{
     "dependencies": ["permission:inputMethodPrivate"],
     "contexts": ["blessed_extension"]
   }, {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": [
-      "chrome://md-settings/*"
+      "chrome://md-settings/*",
+      "chrome://settings/*"
     ]
   }],
   "instanceID": {
     "dependencies": ["permission:gcm"],
     "contexts": ["blessed_extension"]
   },
   "languageSettingsPrivate": [{
     "dependencies": ["permission:languageSettingsPrivate"],
     "contexts": ["blessed_extension"]
   }, {
@@ skipping 130 matching lines @@
   },
   "imageWriterPrivate": {
     "dependencies": ["permission:imageWriterPrivate"],
     "extension_types": ["platform_app"],
     "contexts": ["blessed_extension"]
   },
   "quickUnlockPrivate": {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": [
-      "chrome://md-settings/*"
+      "chrome://md-settings/*",
+      "chrome://settings/*"
     ],
     "platforms": ["chromeos"]
   },
   "resourcesPrivate": [{
     "dependencies": ["permission:resourcesPrivate"],
     "contexts": ["blessed_extension"]
   }, {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": [
@@ skipping 132 matching lines @@
     "internal": true,
     "channel": "stable",
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["api:tabs"],
     "contexts": ["blessed_extension"]
   }
 }