[Merge] ~muktupavels/compiz:lp1863561 into compiz:master

[Alberts Muktupāvels]

Alberts Muktupāvels has proposed merging ~muktupavels/compiz:lp1863561 into compiz:master.

Commit message:
ccsm: remove HeaderStyleSet

Requested reviews:
  Compiz Maintainers (compiz-team)
Related bugs:
  Bug #1863561 in Compiz: "CCSM: Certain text stays black on dark themes"
  https://bugs.launchpad.net/compiz/+bug/1863561

For more details, see:
https://code.launchpad.net/~muktupavels/compiz/+git/compiz/+merge/379278

It was setting foreground color to background color (from selected state). This seems wrong / unneeded with GTK 3.
-- 
Your team Compiz Maintainers is requested to review the proposed merge of ~muktupavels/compiz:lp1863561 into compiz:master.
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