Eagerly finalize V8AbstractEventListeners.
Eagerly finalize V8AbstractEventListeners.

The listener's wrapper needs to be promptly cleared so as to prevent
untidy accesses to a poisoned heap by v8's GC if the listener is instead
lazily swept & finalized.

R=haraken
BUG=491488

Review URL: https://codereview.chromium.org/1263953002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@199721 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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