trash: Don't use try_ for blocking methods
trash: Don't use try_ for blocking methods

Don't use the try_ variants of the GVfsBackend methods for methods that
could block.

https://bugzilla.gnome.org/show_bug.cgi?id=720589

gicmo/gvfs,gicmo/gvfs,gicmo/gvfs,gicmo/gvfs