[Merge] ~khurshid-alam/ubuntu/+source/ubuntu-settings:ambiance-default-for-unity into ~ubuntu-desktop/ubuntu/+source/ubuntu-settings:master

[Didier Roche]

Review: Approve

This indeed LGTM! Thanks a lot :)

Note that Unity will need to dep/recommends light-themes as those won't be seeded anymore, but this doesn't block this one to go, sponsoring.
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https://code.launchpad.net/~khurshid-alam/ubuntu/+source/ubuntu-settings/+git/ubuntu-settings/+merge/353365
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