Update V8 top-level OWNERS: -mmassi +machenbach

R=danno@chromium.org

Review URL: https://codereview.chromium.org/25265002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17005 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

OWNERS

@@ -3,7 +3,7 @@ danno@chromium.org
 dslomov@chromium.org
 hpayer@chromium.org
 jkummerow@chromium.org
-mmassi@chromium.org
+machenbach@chromium.org
 mstarzinger@chromium.org
 mvstanton@chromium.org
 rossberg@chromium.org