They were only used with geometry widgets.

The function was only used by the geometry widget.

Ignore the geometry widget passed to gtk_window_set_geometry_hints().
Usind the widget itself was a hack that complicates the size request
machinery.

It is also incorrect in that it doesn't respect height-for-width.

Last but not least, it was only used by gnome-terminal and that
application can easily work without it.

When recomputing CSS, we need a correct widget path in the fallback mode
where we're still using widget paths.
So we need to invalidate it everytime it actually changes, and not just
when emitting the style-updated signal.

Fixes css-match-regions reftest.

They are not required any more.

http://bugzilla.gnome.org/show_bug.cgi?id=746668

These are fixed pipeline functions, and Mesa will warn (if debugging
messages are enabled). At best, they are poinless calls.