Bug 1484466: Part 5 - Use a single QueryInterface method for all nsIFactory instances. r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D3712

--HG--
extra : rebase_source : d63dc47aed6ab8c35b8352437bdde6c9f3fa1b6d

js/xpconnect/loader/XPCOMUtils.jsm

@@ -57,6 +57,8 @@ var EXPORTED_SYMBOLS = [ "XPCOMUtils" ];
 
 let global = Cu.getGlobalForObject({});
 
+const nsIFactoryQI = ChromeUtils.generateQI([Ci.nsIFactory]);
+
 /**
  * Redefines the given property on the given object with the given
  * value. This can be used to redefine getter properties which do not
@@ -452,7 +454,7 @@ var XPCOMUtils = {
             throw Cr.NS_ERROR_NO_AGGREGATION;
           return (new component()).QueryInterface(iid);
         },
-        QueryInterface: ChromeUtils.generateQI([Ci.nsIFactory])
+        QueryInterface: nsIFactoryQI
       }
     }
     return factory;
@@ -477,7 +479,7 @@ var XPCOMUtils = {
         }
         return this._instance.QueryInterface(aIID);
       },
-      QueryInterface: ChromeUtils.generateQI([Ci.nsIFactory])
+      QueryInterface: nsIFactoryQI
     };
   },