ChromeTracingDelegateBrowserTestOnStartup.StartupTracingThrottle is a flaky crash on linux-chromeos-rel.

https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux_chromium_rel_ng/72678
browser_tests (with patch) 'stdout' snippet.

[ RUN      ] ChromeTracingDelegateBrowserTestOnStartup.StartupTracingThrottle
Xlib:  extension "RANDR" missing on display ":99".
[25630:25785:0417/235544.756368:ERROR:bus.cc(394)] Failed to connect to the bus: Could not parse server address: Unknown address type (examples of valid types are "tcp" and on UNIX "unix")
[25630:25630:0417/235544.764629:WARNING:password_store_factory.cc(240)] Using basic (unencrypted) store for password storage. See https://chromium.googlesource.com/chromium/src/+/master/docs/linux_password_storage.md for more information about password storage options.
(browser_tests:25630): LIBDBUSMENU-GLIB-WARNING **: Unable to get session bus: Unknown or unsupported transport 'disabled' for address 'disabled:'
[25630:25630:0417/235544.894926:WARNING:gaia_auth_fetcher.cc(873)] Could not reach Google Accounts servers: errno -11
[25630:25720:0417/235544.986812:WARNING:discardable_shared_memory_manager.cc(436)] Some MojoDiscardableSharedMemoryManagerImpls are still alive. They will be leaked.
[25630:25847:0417/235544.989853:WARNING:internal_linux.cc(64)] Failed to read /proc/25768/stat
[25630:25748:0417/235544.985630:FATAL:handle.h(98)] Check failed: handle_.is_valid(). 
#0 0x00000593984c base::debug::StackTrace::StackTrace()
#1 0x00000595b2ab logging::LogMessage::~LogMessage()
#2 0x000006032cc0 mojo::BlockingCopyFromString()
#3 0x0000048acab4 tracing::Coordinator::TraceStreamer::StreamEventsForCurrentLabel()
#4 0x0000048abfa1 tracing::Coordinator::TraceStreamer::OnRecorderDataChange()
#5 0x000003b46eed _ZN4base8internal7InvokerINS0_9BindStateIMN5media12PipelineImplEFvRKN3gfx4SizeEEJNS_7WeakPtrIS4_EES6_EEEFvvEE3RunEPNS0_13BindStateBaseE
#6 0x0000048adcd2 tracing::Recorder::OnConnectionError()
#7 0x0000022360a4 _ZN4base8internal7InvokerINS0_9BindStateIMN12_GLOBAL__N_116SimpleHttpServer10ConnectionEFvvEJNS_7WeakPtrIS5_EEEEEFvvEE7RunOnceEPNS0_13BindStateBaseE
#8 0x000006aaf3a9 mojo::InterfaceEndpointClient::NotifyError()
#9 0x000006ab70f3 mojo::internal::MultiplexRouter::ProcessNotifyErrorTask()
#10 0x000006ab409b mojo::internal::MultiplexRouter::ProcessTasks()
#11 0x000006ab27e8 mojo::internal::MultiplexRouter::OnPipeConnectionError()
#12 0x000006aaaccf mojo::Connector::HandleError()
#13 0x000006aab181 mojo::Connector::ReadSingleMessage()
#14 0x000006aabca4 mojo::Connector::ReadAllAvailableMessages()
#15 0x000006aabb06 mojo::Connector::OnHandleReadyInternal()
#16 0x000003ebb1b4 mojo::SimpleWatcher::DiscardReadyState()
#17 0x000006035db5 mojo::SimpleWatcher::OnHandleReady()
#18 0x00000603633e _ZN4base8internal7InvokerINS0_9BindStateIMN4mojo13SimpleWatcherEFvijRKNS3_18HandleSignalsStateEEJNS_7WeakPtrIS4_EEijS5_EEEFvvEE7RunImplIRKS9_RKNSt3__15tupleIJSB_ijS5_EEEJLm0ELm1ELm2ELm3EEEEvOT_OT0_NSI_16integer_sequenceImJXspT1_EEEE
#19 0x00000593af30 base::debug::TaskAnnotator::RunTask()
#20 0x0000059c004f base::internal::TaskTracker::RunOrSkipTask()
#21 0x0000059c13fb base::internal::TaskTrackerPosix::RunOrSkipTask()
#22 0x0000059bf3d6 base::internal::TaskTracker::RunAndPopNextTask()
#23 0x0000059bbcd0 base::internal::SchedulerWorker::Thread::ThreadMain()
#24 0x0000059c97ff base::(anonymous namespace)::ThreadFunc()
#25 0x7f725d4ae184 start_thread
#26 0x7f7257908ffd clone

/me not gardening, but assigning to oysteine@ for triage.