[gtk] (10 commits) ...Merge branch 'kill-register-surface' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  69b1a34... a11y tests: Update output for entries (*)
  a13d850... Add gtk_root_get_for_surface (*)
  2501152... ime: Stop using gdk_surface_get_user_data (*)
  ea4f552... xim: Stop using gdk_surface_get_user_data (*)
  4e8aa0c... main: Stop using gdk_surface_get_user_data (*)
  12663d2... tooltip: Stop using gdk_surface_get_user_data (*)
  704e377... inspector: Stop using gdk_surface_get_user_data (*)
  09fea73... gtk-demo: Stop using gdk_surface_get_user_data (*)
  cc216c9... Remove gdk_surface_set_user_data (*)
  0d39cb7... Merge branch 'kill-register-surface' into 'master'

(*) This commit already existed in another branch; no separate mail sent