My guesses:

libqt4-phonon
libsqlite3-0
libxcb1

The problem is that the version of Qt referenced in the firmware is not optified, so the whole phonon/webkit/gui shebang will end up on the internal flash. It's supposedly fixed (along with the dependency problem) in PR1.1

OR you can depend on the 4.6 version of webkit, which automatically solves the optification/dependency problem, but is not available outside of extras-devel.