tree b0fb81449394f1c9f7832684988293dffdfc6396
parent dd7a7f012424ec8505830710ac0dd0183203c189
author Tom Sepez <tsepez@chromium.org> 1442961555 -0700
committer Tom Sepez <tsepez@chromium.org> 1442961555 -0700

Use std::set<> to track active event handlers.

This avoids some custom linked-list code. Also note that
we use a local copy to be sure we removed the same thing
that was added no matter how our callees may muck with the
handler.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1352393003 .