Whitelist the new demo app for chromeosInfoPrivate

The new demo app uses chromeosInfoPrivate API (only) to get
the board name.

BUG=782139

Change-Id: I92504073044d3b0f2b963d0acdbb4a8d67a2cd7b
Reviewed-on: https://chromium-review.googlesource.com/771450Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Greg Levin <glevin@chromium.org>
Commit-Queue: Keigo Oka <oka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517753}

chrome/common/extensions/api/_permission_features.json

@@ -138,7 +138,8 @@
       "2B6C6A4A5940017146F3E58B7F90116206E84685",  // http://crbug.com/642141
       "B6C2EFAB3EC3BF6EF03701408B6B09A67B2D0069",  // http://crbug.com/642141
       "96FF2FFA5C9173C76D47184B3E86D267B37781DE",  // http://crbug.com/642141
-      "0136FCB13DB29FD5CD442F56E59E53B61F1DF96F"   // http://crbug.com/642141
+      "0136FCB13DB29FD5CD442F56E59E53B61F1DF96F",  // http://crbug.com/642141
+      "930F7D9989A5FBCDCCD7D85BB5C3B7006C24D91D"   // http://crbug.com/782139
     ]
   },
   "clipboardRead": {