Revert r20474

This reverts commit r20474 due to an x64 release issue.

R=yangguo@chromium.org

Review URL: https://codereview.chromium.org/223823002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20478 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Return MaybeHandle from NewRaw???String.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/223573002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20479 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Reland "Return MaybeHandle from NewConsString."

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/223813002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@20480 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Merge remote-tracking branch 'upstream/bleeding_edge' into bleeding_edge