Oilpan: add more Event-related USED_FROM_MULTIPLE_THREADS() decls.

CloseEvent and XMLHttpRequestProgressEvent are also exposed inside Workers.

R=
BUG=340522

Review URL: https://codereview.chromium.org/178193014

git-svn-id: svn://svn.chromium.org/blink/trunk@168240 bbb929c8-8fbe-4397-9dbb-9b2b20218538