Jonas Jenwald 48242abe72 [B2G] Stub the |DownloadManager| to avoid error
After the refactoring in PR 5678, the B2G viewer now prints the following in the console:
```
ReferenceError: DownloadManager is not defined
```

This will obviously not matter once the B2G viewer is replaced with the new components-based one. But until that happens, I think it makes sense to just stub the class to suppress the error.
2015-04-04 21:26:33 +02:00
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