[gtk] (5 commits) Non-fast-forward update to branch tests-cleanup

[Matthias Clasen <matthiasc src gnome org>]

The branch 'tests-cleanup' 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:

  252df6d... tests: Drop testpixbuf-scale
  82290f7... tests: Drop testicontheme
  5e6d6d2... tests: Drop testcolorchooser2

Commits added to the branch:

  c3aeac1... tests: Drop testpixbuf-scale
  1420e84... tests: Drop testicontheme
  604f4cf... tests: Drop testcolorchooser2
  661d780... tests: Drop showrendernode
  f199bfc... tests: Drop testbox