Merge remote-tracking branch 'remotes/kraxel/tags/pull-gtk-20140611-1' into staging

gtk: misc fixes & cleanups.

# gpg: Signature made Wed 11 Jun 2014 13:28:12 BST using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-gtk-20140611-1:
  gtk: update window size after showing/hiding tabs
  gtk: factor out gtk3 grab into the new gd_grab_devices function
  gtk: cleanup backend dependencies
  gtk: factor out keycode mapping

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>