Set more event callbacks in jQuery externs to have non-null but optional arguments.
Set more event callbacks in jQuery externs to have non-null but optional arguments.

R=johnlenz

git-svn-id: 818616af560c21f974e3119d89e3310384da871a@1841 b0f006be-c8cd-11de-a2e8-8d36a3108c74

dound/google-closure-compiler,h4ck3rm1k3/javascript-closure-compiler-git,dound/google-closure-compiler,h4ck3rm1k3/javascript-closure-compiler-git,bramstein/closure-compiler-inline,bramstein/closure-compiler-inline