Revert "Drop all events fired at documents or windows that have script disabled"

This reverts commit http://src.chromium.org/viewvc/blink?revision=171099&view=revision

It broke context menus in sandboxed iframes. It doesn't appear it's ever safe
to really drop events, since C++ might be listening for them.

BUG=362683
TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/238213007

git-svn-id: svn://svn.chromium.org/blink/trunk@171540 bbb929c8-8fbe-4397-9dbb-9b2b20218538