Move to new API for importing Services

src/modules/utils.js

 // # Utils.js
 // Various helpful utility functions.
 
-// ### Shortcut
-let { Cu, Cc, Ci } = require('chrome');
-
 // ### Import Mozilla Services
-Cu.import("resource://gre/modules/Services.jsm");
+var { Services }  = require("resource://gre/modules/Services.jsm");
+
 
 // ## Pref utils