Chrome Version: ToT
OS: Android

What steps will reproduce the problem?
(1) Download .wav from http://soundbible.com/2154-Text-Message-Alert-1.html.

What is the expected result?
DownloadItem.GetMimeType() returns some audio mimeType.

What happens instead?
It returns empty mimeType. However, Downloads UI has proper mimeType in java somehow.

This influences which icons we show.