[Merge] ~khurshid-alam/ubuntu/+source/ubuntu-settings:nemo-desktop into ~ubuntu-desktop/ubuntu/+source/ubuntu-settings:master

[Khurshid Alam]

unity-session derives from gnome-session. Would that be ok ?
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https://code.launchpad.net/~khurshid-alam/ubuntu/+source/ubuntu-settings/+git/ubuntu-settings/+merge/362663
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