Vasu Nori 45b43622e3 add method in MediaFile to determine if a file is a mediatype of not
this helps DownloadService to avoid invoking MediaScanner on
pdf or other non-mediatype files.

Change-Id: I92514e1a11f5119229c0c7292e410e352a9dbcdd
2010-10-26 16:12:27 -07:00
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