Use size_t in GCIdleTimeHandler to fix undefined behaviour.

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/490943002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23248 ce2b1a6d-e550-0410-aec6-3dcde31c8c00