In r174387 modules-dependent eventtarget code were moved out of core.

Follow up for CL https://codereview.chromium.org/297493004/

Review URL: https://codereview.chromium.org/299753008

git-svn-id: svn://svn.chromium.org/blink/trunk@174498 bbb929c8-8fbe-4397-9dbb-9b2b20218538