Bug 938177 - Browser Settings Moved to System Settings

Duplicates browser app's settings in Settings. Browser app is apparently
being deleted, so modifications there likely do not matter.
please try to offload js from main settings page.
 
we can use AMD module to wrap each panel, please refer
https://github.com/mozilla-b2g/gaia/tree/master/apps/settings#how-to-port-an-existing-panel-to-follow-the-new-architecture-design