The function made sure that the code model knew about changes
to the ui_*.h files. This code was written before introducing
Qt4UiCodeModelSupport, which does ensure that the ui*.h files
on disk actually do not matter for the code model at all.
Removing this code improves switching Kits performance in some
cases.

Change-Id: I51f9fcc9cac23013eaf89a2a8517f2bd58953263
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>