Fix changed expectation in Heap::AllowToBeMigrated.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/364173004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22194 ce2b1a6d-e550-0410-aec6-3dcde31c8c00