**Do you want to request a _feature_ or report a _bug_?**

This is a bug (I think)

**What is the current behavior?**

When rendering `<input type="..." />` (without name attribute), it will render `<input type="..." name />` to the DOM.

![2016-07-06 at 09 49](https://cloud.githubusercontent.com/assets/11071/16611205/13bcd376-4360-11e6-9ef5-de6bec6eaa4a.png)

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/reactjs/69z2wepo/).**

Here is the example with the regression using React 15.2.0: https://esnextb.in/?gist=c4923716061ca73e37f7ed476920aa9c

![2016-07-06 at 09 49](https://cloud.githubusercontent.com/assets/11071/16611190/0ba328e8-4360-11e6-8e1a-049048c661f5.png)

**What is the expected behavior?**

No `name` attribute rendered if it is not provided.

Here is the expected behavior with React 15.1.0: https://esnextb.in/?gist=aee86dfa6eec38aa2bc24b4c25425905

![2016-07-06 at 09 54](https://cloud.githubusercontent.com/assets/11071/16611196/10edae9a-4360-11e6-8191-eb19fd9363f8.png)

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

Regression: v15.2.0

Good: v15.1.0

'element and remove one of these props. More info: ' +
          'https://fb.me/react-controlled-components',
          owner && owner.getName() || 'A component',
          props.type
        );
        didWarnValueDefaultValue = true;
      }
    }
    var defaultValue = props.defaultValue;
    inst._wrapperState = {
      initialChecked: props.checked != null ? props.checked : props.defaultChecked,
      initialValue: props.value != null ? props.value : defaultValue,
      listeners: null,
      onChange: _handleChange.bind(inst),
    };
    if (__DEV__) {
      inst._wrapperState.controlled = isControlled(props);
    }
  },
  updateWrapper: function(inst) {
    var props = inst._currentElement.props;
    if (__DEV__) {
      var controlled = isControlled(props);
      var owner = inst._currentElement._owner;
      if (!inst._wrapperState.controlled && controlled && !didWarnUncontrolledToControlled) {
        warning(
          false,
          '%s is changing an uncontrolled input of type %s to be controlled. ' +
          'Input elements should not switch from uncontrolled to controlled (or vice versa). ' +
          'Decide between using a controlled or uncontrolled input ' +