Re: [w3c/IndexedDB] Integrate with window.onerror (#49)

Note: 
In FF, there is a propagation path as mentioned in https://github.com/w3c/IndexedDB/issues/49#issuecomment-237172028

Hence, for the case of 
```js
  store.put(v, k).onerror = e => {
    console.warn('this will appear'); // will not invoke window.onerror handler
  };
```
window.onerror will still be invoked if e.preventDefault() is not invoked in this onerror callback.

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