chore: remove unused createObject fn

src/NodeBind.js

@@ -25,24 +25,6 @@
     return typeof node.getElementById === 'function' ? node : null;
   }
 
-  // JScript does not have __proto__. We wrap all object literals with
-  // createObject which uses Object.create, Object.defineProperty and
-  // Object.getOwnPropertyDescriptor to create a new object that does the exact
-  // same thing. The main downside to this solution is that we have to extract
-  // all those property descriptors for IE.
-  var createObject = ('__proto__' in {}) ?
-      function(obj) { return obj; } :
-      function(obj) {
-        var proto = obj.__proto__;
-        if (!proto)
-          return obj;
-        var newObject = Object.create(proto);
-        Object.getOwnPropertyNames(obj).forEach(function(name) {
-          Object.defineProperty(newObject, name,
-                               Object.getOwnPropertyDescriptor(obj, name));
-        });
-        return newObject;
-      };
 
   // IE does not support have Document.prototype.contains.
   if (typeof document.contains != 'function') {