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huangqi03 af5c21b1ef fix: webview.postMessage throws not a constructor in WebView in Android 4.1 ~ 4.3

Summary:
`new MessageEvent` not support for Android 4.1 ~ 4.3 WebView.

change

``` javascript
document.dispatchEvent(new MessageEvent('message', data)))
```

to

``` javascript
(function () {
  var event;
  var data = {};
  try {
    event = new MessageEvent('message', data);
  } catch (e) {
    event = document.createEvent('MessageEvent');
    event.initMessageEvent('message', true, true, data.data, data.origin, data.lastEventId, data.source);
  }
  document.dispatchEvent(event);
})()
```
Closes https://github.com/facebook/react-native/pull/11560

Differential Revision: D4461360

fbshipit-source-id: 110220817d9570e86b31dcf8fe85f6616d54d36e

2017-01-29 08:58:37 -08:00