Adding extra OR condition to loading the shims. This seems to fix a p…

…roblem with the traceur runtime.

es6-shim.js

@@ -1822,6 +1822,7 @@
           typeof globals.Map.prototype.clear !== 'function' ||
           new globals.Set().size !== 0 ||
           new globals.Map().size !== 0 ||
+          typeof globals.Map.prototype.keys !== 'function' ||
           typeof globals.Set.prototype.keys !== 'function' ||
           typeof globals.Map.prototype.forEach !== 'function' ||
           typeof globals.Set.prototype.forEach !== 'function' ||