crash log for renderer (pid <unknown>):
STDOUT: <empty>
STDERR: ASSERTION FAILED: scriptState->contextIsValid()
STDERR: ../../third_party/WebKit/Source/bindings/core/v8/ScriptState.h(38) : blink::ScriptState::Scope::Scope(blink::ScriptState *)
STDERR: 1   0x7fa17d7489d8
STDERR: 2   0x7fa17d83a9d7 blink::BodyStreamBuffer::BodyStreamBuffer(blink::ScriptState*, WTF::PassOwnPtr<blink::FetchDataConsumerHandle>)
STDERR: 3   0x7fa17d856763
STDERR: 4   0x7fa17fd6121a blink::DocumentThreadableLoader::handleResponse(unsigned long, blink::ResourceResponse const&, WTF::PassOwnPtr<blink::WebDataConsumerHandle>)
STDERR: 5   0x7fa17fd60392 blink::DocumentThreadableLoader::responseReceived(blink::Resource*, blink::ResourceResponse const&, WTF::PassOwnPtr<blink::WebDataConsumerHandle>)
STDERR: 6   0x7fa17fb56b20 blink::RawResource::responseReceived(blink::ResourceResponse const&, WTF::PassOwnPtr<blink::WebDataConsumerHandle>)
STDERR: 7   0x7fa17fb7d1e4 blink::ResourceLoader::didReceiveResponse(blink::WebURLLoader*, blink::WebURLResponse const&, blink::WebDataConsumerHandle*)
STDERR: 8   0x7fa1883d9829 content::WebURLLoaderImpl::Context::OnReceivedResponse(content::ResourceResponseInfo const&)
STDERR: 9   0x7fa1883da9fc content::WebURLLoaderImpl::RequestPeerImpl::OnReceivedResponse(content::ResourceResponseInfo const&)
STDERR: 10  0x7fa1883739e5 content::ResourceDispatcher::OnReceivedResponse(int, content::ResourceResponseHead const&)
STDERR: 11  0x7fa18837e0c2
STDERR: 12  0x7fa18837e005
STDERR: 13  0x7fa18837deef
STDERR: 14  0x7fa188379729
STDERR: 15  0x7fa188372fb0 content::ResourceDispatcher::DispatchMessage(IPC::Message const&)
STDERR: 16  0x7fa188372829 content::ResourceDispatcher::OnMessageReceived(IPC::Message const&)
STDERR: 17  0x7fa188381555 content::ResourceSchedulingFilter::DispatchMessage(IPC::Message const&)
STDERR: 18  0x7fa1883817da
STDERR: 19  0x7fa17d252dfe scheduler::WebTaskRunnerImpl::runTask(std::unique_ptr<blink::WebTaskRunner::Task, std::default_delete<blink::WebTaskRunner::Task> >)
STDERR: 20  0x7fa17d253e9a
STDERR: 21  0x7fa17d253e05
STDERR: 22  0x7fa17d253dc6
STDERR: 23  0x7fa18750189e
STDERR: 24  0x7fa18752702e base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask const&)
STDERR: 25  0x7fa17d22ade4 scheduler::TaskQueueManager::ProcessTaskFromWorkQueue(scheduler::internal::WorkQueue*, scheduler::internal::TaskQueueImpl::Task*)
STDERR: 26  0x7fa17d228d22 scheduler::TaskQueueManager::DoWork(base::TimeTicks, bool)
STDERR: 27  0x7fa17d23057e
STDERR: 28  0x7fa17d23047a
STDERR: 29  0x7fa17d2303f8
STDERR: 30  0x7fa18750189e
STDERR: 31  0x7fa18752702e base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask const&)