Actually it was inconsistent before as well, as Ubuntu use the Human icon set by default and Human don't have these icons, so it used to fall back on the icons provided by tango-common.
-- GTK default icons used in several places https://launchpad.net/bugs/60424 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
