Revert "VolumeDialogImpl: Handle cases where media controller is not available"

Dosen't seem to be needed on QPR3

This reverts commit 01fc4ce8e77eb32019cf5e0c42d3943e2d5b3451.

Change-Id: I1d8d0ff1126dba29ebeb6a36e4e9981af3ec58e1
1 file changed