Revert "Remove dependence on ES5 shams per #4189"

src/isomorphic/classic/element/ReactElement.js

@@ -109,10 +109,8 @@ var ReactElement = function(type, key, ref, self, source, owner, props) {
       element._self = self;
       element._source = source;
     }
-    if (Object.freeze) {
-      Object.freeze(element.props);
-      Object.freeze(element);
-    }
+    Object.freeze(element.props);
+    Object.freeze(element);
   }
 
   return element;

src/renderers/dom/ReactDOM.js

@@ -98,12 +98,16 @@ if (__DEV__) {
       Object.keys,
       String.prototype.split,
       String.prototype.trim,
+
+      // shams
+      Object.create,
+      Object.freeze,
     ];
 
     for (var i = 0; i < expectedFeatures.length; i++) {
       if (!expectedFeatures[i]) {
         console.error(
-          'One or more ES5 shims expected by React are not available: ' +
+          'One or more ES5 shim/shams expected by React are not available: ' +
           'https://fb.me/react-warning-polyfills'
         );
         break;

src/renderers/dom/client/syntheticEvents/SyntheticEvent.js

@@ -175,10 +175,7 @@ SyntheticEvent.Interface = EventInterface;
 SyntheticEvent.augmentClass = function(Class, Interface) {
   var Super = this;
 
-  var E = function () {};
-  E.prototype = Super.prototype;
-  var prototype = new E();
-
+  var prototype = Object.create(Super.prototype);
   assign(prototype, Class.prototype);
   Class.prototype = prototype;
   Class.prototype.constructor = Class;