function arrayBufferToBlob(buffer, type) {
        return createBlob([buffer], type);
    }
Convert an <code>ArrayBuffer</code> to a <code>Blob</code>.

Example:

```js
var blob = blobUtil.arrayBufferToBlob(arrayBuff, 'audio/mpeg');
```

@param buffer
@param type - the content type (optional)
@returns Blob