This is a follow-on to r8340, http://codereview.chromium.org/7216004/

Søren had commited changes and closed issue, as Karl was commenting about
problems in the code.

Thanks Karl, for your detailed code review. I have corrected the issues
you raised.

BUG=
TEST=

Review URL: http://codereview.chromium.org//7232004
Patch from Paul Lind <plind44@gmail.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8358 ce2b1a6d-e550-0410-aec6-3dcde31c8c00