This reverts commit r17798 for allocating too much memroy in tests.

TBR=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/74093002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17799 ce2b1a6d-e550-0410-aec6-3dcde31c8c00