All clients has been changed to use
SfxViewShell::registerLibreOfficeKitViewCallback() instead.

Change-Id: I2538268dc9c4b449f68b5d2b05a72de584c29fd0
Reviewed-on: https://gerrit.libreoffice.org/26540Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>