[gtk] (7 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  b030188... frame: Drop shadow-type
  30abcf9... viewport: Drop shadow-type
  23d3d6f... Drop GtkShadowType
  b7913cf... button: Drop relief
  dc8e7be... menubutton: Drop relief
  1859551... Drop GtkReliefStyle

Commits added to the branch:

  4d7506c... treeviewcolumn: Stop using a frame
  372e0ec... frame: Drop shadow-type
  5cdfb63... viewport: Drop shadow-type
  f6edd04... Drop GtkShadowType
  11f7a8a... button: Drop relief
  f84dfe9... menubutton: Drop relief
  ce9b773... Drop GtkReliefStyle