[mutter] (7 commits) Non-fast-forward update to branch wip/surface-content

[Jasper St. Pierre <jstpierre src gnome org>]

The branch 'wip/surface-content' 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:

  2b5e7fb... window-group: Don't special-case the unredirected window
  3e8b042... window-actor: Split into two subclasses of MetaSurfaceActor

Commits added to the branch:

  f9f2a82... xwayland: Don't -retro (*)
  c485637... default: Don't use anchor points (*)
  2e7a56a... wayland: Rename resource_destroy_cb to wl_surface_destructo (*)
  515dc08... pointer/keyboard: Do a series of renames to our listener as (*)
  b656491... pointer/keyboard: Put the destroy listener on the right res (*)
  05b5406... window-group: Don't special-case the unredirected window
  57300cb... window-actor: Split into two subclasses of MetaSurfaceActor

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