Fix test after r21299.

This fixes Win and Mac test failures.

TBR=danno@chromium.org

Review URL: https://codereview.chromium.org/282863005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21303 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Print new space survival rate in --trace-gc-nvp.

BUG=
R=jarin@chromium.org

Review URL: https://codereview.chromium.org/287873003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21304 ce2b1a6d-e550-0410-aec6-3dcde31c8c00