Remove redudant deleted_count argument from EnqueueSpliceRecord

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/16438010

Patch from Rafael Weinstein <rafaelw@chromium.org>.

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@14989 ce2b1a6d-e550-0410-aec6-3dcde31c8c00