<https://bugs.webkit.org/show_bug.cgi?id=34974>

Reviewed by Alexey Proskuryakov.

ScheduledAction::create was returning a raw pointer which was threaded down through to an OwnPtr in DOMTimer.
If any of the code paths in between hit an error case and returned early the raw pointer would be leaked.  We
can avoid this by passing it as a PassOwnPtr.  This will ensure that the ScheduledAction is cleaned up should
an error case be hit.

* bindings/js/JSDOMWindowCustom.cpp:
(WebCore::JSDOMWindow::setTimeout): Store the newly-created ScheduledAction in an OwnPtr and then hand it off
as the function argument.
(WebCore::JSDOMWindow::setInterval): Ditto.
* bindings/js/JSWorkerContextCustom.cpp:
(WebCore::JSWorkerContext::setTimeout): Ditto.
(WebCore::JSWorkerContext::setInterval): Ditto.
* bindings/js/ScheduledAction.cpp:
(WebCore::ScheduledAction::create): Return a PassOwnPtr.
* bindings/js/ScheduledAction.h:
* page/DOMTimer.cpp:
(WebCore::DOMTimer::DOMTimer): Update argument type.
(WebCore::DOMTimer::install): Ditto.
* page/DOMTimer.h:
* page/DOMWindow.cpp:
(WebCore::DOMWindow::setTimeout): Ditto.
(WebCore::DOMWindow::setInterval): Ditto.
* page/DOMWindow.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@54835 268f45cc-cd09-0410-ab3c-d52691b4dbfc