Revert "Fixing timezone issues with date-time/parse-* tests."

This reverts commit r17148 for breaking tests on Windows.

TBR=cira@google.com,titzer@chromium.org

Review URL: https://codereview.chromium.org/26467005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@17149 ce2b1a6d-e550-0410-aec6-3dcde31c8c00