Revert "Add mechanism to postpone interrupts selectively."

This reverts commit r22073.

TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/362493002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22074 ce2b1a6d-e550-0410-aec6-3dcde31c8c00