Bug 941885 - Hide 3rd-party keyboard apps under a settings db entry
Bug 941885 - Part 2, disable the feature for now
Merge pull request #13967 from timdream/keyboard-pref-off2

Bug 941885 - Hide 3rd-party keyboard apps under a settings db entry, r=rudyl
Bug 897325: Part 2 - support preloading app from marketplace