Revert "Remove C++11-ism, until all bots support it."

This reverts commit r23463 as by now >> shouldn't be a syntax error anymore in chromium.

TBR=vogelheim@chromium.org, svenpanne@chromium.org

Review URL: https://codereview.chromium.org/512123002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23472 ce2b1a6d-e550-0410-aec6-3dcde31c8c00