Patch to follow.
Created attachment 109455 [details] Patch
Committed r96487: <http://trac.webkit.org/changeset/96487>
This may have broken script-formatter.html on Snow Leopard: http://build.webkit.org/results/SnowLeopard%20Intel%20Release%20(Tests)/r96571%20(33608)/inspector/debugger/script-formatter-pretty-diff.html