GtkPopover: Remove _get_pointed_to_coords
GtkPopover: Remove _get_pointed_to_coords

It's only used once and removing it only adds a single line there.

https://bugzilla.gnome.org/show_bug.cgi?id=755435

grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,alexlarsson/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,alexlarsson/gtk,alexlarsson/gtk,grubersjoe/adwaita,grubersjoe/adwaita,alexlarsson/gtk