This is a bug in `React.createElement` code:

`React.createElement` does not warn if `props.__proto__` is null ( from `Object.create(null)` ) since it [believes that to be a plain object](https://github.com/facebook/react/blob/master/src/isomorphic/classic/element/ReactElement.js#L135) originating from #6134. But since it directly accesses `hasOwnProperty` it fails if such object is passed as props.

Reproduce:

``` js
const props = Object.create(null);
React.createElement(() => null, props);
```

**What is the expected behavior?**
It shouldn't use `hasOwnProperty` directly on props if such object is expected.

React: 15.1.0
Browsers: All
OS: All

This affects all versions of React but since after 15.1.0 the acceptable shape of props is explicitly defined then it should be explicitly supported as well.

var Component = React.createClass({
      render: () => null,
      statics: {
        specialType: React.PropTypes.shape({monkey: React.PropTypes.any}),
      },
    });
    expect(typeof Component.specialType).toBe('function');
    expect(typeof Component.specialType.isRequired).toBe('function');
  });
  
  
  it('is indistinguishable from a plain object', function() {
    var element = React.createElement('div', {className: 'foo'});
    var object = {};
    expect(element.constructor).toBe(object.constructor);
  });
  
  
  it('should use default prop value when removing a prop', function() {
    var Component = React.createClass({
      getDefaultProps: function() {
        return {fruit: 'persimmon'};
      },
      render: function() {
        return React.createElement('span');
      },
    });
    var container = document.createElement('div');