fast/loader/cancel-load-during-port-block-timer.html
Loading this DRT test into WebLaucher causes a JVM crash. Stack dump is attached as hs_err_pid7632.log.

Two assertions fire just before the crash:
     [java] ASSERTION FAILED: d->m_loader
     [java] ../../../Source/WebCore/platform/network/java/ResourceHandleJava.cpp(29) : virtual void WebCore::ResourceHandle::cancel()
     [java] ASSERTION FAILED: m_ptr
     [java] ../../../Source/WTF/wtf/OwnPtr.h(64) : WTF::OwnPtr<T>::ValueType* WTF::OwnPtr<T>::operator->() const [with T = WebCore::URLLoader, WTF::OwnPtr<T>::ValueType* = WebCore::URLLoader*, WTF::OwnPtr<T>::ValueType = WebCore::URLLoader]