I don't see why we should change the volume at all, let the user decide their volume, but since we have the feature i didn't want to remove it completely and instead left if disabled by default.
Acked by davidedmundson and sitter
REVIEW: 121278
FIXED-IN: 15.04
BUGS: 324975
searching trought the Git repository log (no changelog/news file)
I found that the deprecation of QString argument to MediaSource is
in 2013 or prior that. Not sure which release exactly that was in.