[gnome-shell] Non-fast-forward update to branch wip/chergert/no-fsync-on-main-thread

[Christian Hergert <chergert src gnome org>]

The branch 'wip/chergert/no-fsync-on-main-thread' 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:

  249b7a3... global: force fsync() to worker thread when saving state

Commits added to the branch:

  ff7d4bf... global: force fsync() to worker thread when saving state