Bug 80053

This has started to crash in Chromium debug layout tests: http://test-results.appspot.com/dashboards/flakiness_dashboard.html#showExpectations=true&tests=svg%2FW3C-SVG-1.1%2Fanimate-elem-32-t.svg Assertion: ASSERTION FAILED: (*it)->shadowTreeElement()->correspondingElement() third_party/WebKit/Source/WebCore/svg/SVGElementInstance.cpp(124) : static void WebCore::SVGElementInstance::invalidateAllInstancesOfElement(WebCore::SVGElement*) Stack trace: [44225:44225:16152245608809:ERROR:process_util_posix.cc(142)] Received signal 11 base::debug::StackTrace::StackTrace() [0x735fc6] base::(anonymous namespace)::StackDumpSignalHandler() [0x6efba9] 0x7f6527079af0 WebCore::SVGElementInstance::invalidateAllInstancesOfElement() [0x1b6b521] WebCore::SVGElementInstance::InvalidationGuard::~InvalidationGuard() [0x1b3e7af] WebCore::SVGCircleElement::svgAttributeChanged() [0x1b4c86d] WebCore::SVGElement::attributeChanged() [0x1b6661c] WebCore::Element::didModifyAttribute() [0xd5203d] WebCore::Element::setAttributeInternal() [0xd54fe8] WebCore::Element::setAttribute() [0xd4cc43] WebCore::setTargetAttributeAnimatedXMLValue() [0x1b49440] WebCore::SVGAnimationElement::setTargetAttributeAnimatedValue() [0x1b494f6] WebCore::SVGAnimateElement::applyResultsToTarget() [0x1b42a23] WebCore::SMILTimeContainer::updateAnimations() [0x1bfcae7] WebCore::SMILTimeContainer::timerFired() [0x1bfc0eb] WebCore::Timer<>::fired() [0x1bd7f5a] WebCore::ThreadTimers::sharedTimerFiredInternal() [0xf60dac] WebCore::ThreadTimers::sharedTimerFired() [0xf60ce3] webkit_glue::WebKitPlatformSupportImpl::DoTimeout() [0x1cb51ec] base::BaseTimer<>::TimerTask::Run() [0x1cb58f7] base::internal::RunnableAdapter<>::Run() [0x1f09f39] base::internal::InvokeHelper<>::MakeItSo() [0x1f09ebd] base::internal::Invoker<>::Run() [0x1f09e69] base::Callback<>::Run() [0x6ac077] MessageLoop::RunTask() [0x6c74e4] MessageLoop::DeferOrRunPendingTask() [0x6c75fb] MessageLoop::DoWork() [0x6c7e1d] base::MessagePumpGlib::RunWithDispatcher() [0x727108] base::MessagePumpGlib::Run() [0x7274e8] MessageLoop::RunInternal() [0x6c71ab] MessageLoop::RunHandler() [0x6c705e] MessageLoop::Run() [0x6c6993] webkit_support::RunMessageLoop() [0x631eab] TestShell::waitTestFinished() [0x4723ca] TestShell::runFileTest() [0x46aa4f] runTest() [0x433784] main [0x43428b] 0x7f6527064c4d 0x41fad9 None