Bug 1484466: Part 4 - Remove unnecessary lockFactory stub method implementation. r=mccr8

XPConnect will handle dispatching an appropriate error for these calls.

Differential Revision: https://phabricator.services.mozilla.com/D3711

--HG--
extra : rebase_source : 659a429248aea6bb70d76f0ba24241ae64056772

js/xpconnect/loader/XPCOMUtils.jsm

@@ -477,9 +477,6 @@ var XPCOMUtils = {
         }
         return this._instance.QueryInterface(aIID);
       },
-      lockFactory: function XPCU_SF_lockFactory(aDoLock) {
-        throw Cr.NS_ERROR_NOT_IMPLEMENTED;
-      },
       QueryInterface: ChromeUtils.generateQI([Ci.nsIFactory])
     };
   },