Assert in JSC::Heap::unprotect when closing facebook.com web site
https://bugs.webkit.org/show_bug.cgi?id=115058

Reviewed by Darin Adler.

Grab a JSLock before calling RootObject::invalidate().

* bindings/js/ScriptController.cpp:
(WebCore::ScriptController::~ScriptController):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149188 268f45cc-cd09-0410-ab3c-d52691b4dbfc