The test that started failing is ContextLostIntegrationTest.GpuCrash_GPUProcessCrashesExactlyOncePerVisitToAboutGpuCrash with the following build:

https://build.chromium.org/p/chromium.gpu/builders/Win7%20Debug%20%28NVIDIA%29/builds/52943

Here is a stack trace:

[1008:724:0620/120904.963:FATAL:crash_logging.cc(59)] Check failed: crash_key. All crash keys must be registered before use (key = gpu-channel-filter-trace)
Backtrace:
	base::debug::StackTrace::StackTrace [0x100AE5D7+55]
	base::debug::StackTrace::StackTrace [0x100AE271+17]
	logging::LogMessage::~LogMessage [0x10102DBE+94]
	base::debug::SetCrashKeyValue [0x100A9BA3+211]
	base::debug::SetCrashKeyFromAddresses [0x100A99D2+418]
	base::debug::SetCrashKeyToStackTrace [0x100A9AAD+45]
	gpu::GpuChannelMessageFilter::~GpuChannelMessageFilter [0x0E8F5D70+64]
	gpu::GpuChannelMessageFilter::`vector deleting destructor' [0x0E8F890D+77]
	base::RefCountedThreadSafe<IPC::MessageFilter,base::DefaultRefCountedThreadSafeTraits<IPC::MessageFilter> >::DeleteInternal [0x0EF029A7+39]
	base::DefaultRefCountedThreadSafeTraits<IPC::MessageFilter>::Destruct [0x0EF02BBC+12]
	base::RefCountedThreadSafe<IPC::MessageFilter,base::DefaultRefCountedThreadSafeTraits<IPC::MessageFilter> >::Release [0x0EF0423A+58]
	scoped_refptr<IPC::MessageFilter>::Release [0x0EF0428E+14]
	scoped_refptr<IPC::MessageFilter>::~scoped_refptr<IPC::MessageFilter> [0x0EF0071A+26]
	scoped_refptr<IPC::MessageFilter>::`scalar deleting destructor' [0x0EF01DDF+15]
	std::allocator<scoped_refptr<IPC::MessageFilter> >::destroy<scoped_refptr<IPC::MessageFilter> > [0x0EEFEF41+17]
	std::allocator_traits<std::allocator<scoped_refptr<IPC::MessageFilter> > >::destroy<scoped_refptr<IPC::MessageFilter> > [0x0EEFEF5F+15]
	std::_Wrap_alloc<std::allocator<scoped_refptr<IPC::MessageFilter> > >::destroy<scoped_refptr<IPC::MessageFilter> > [0x0EEFEF14+20]
	std::_Destroy_range1<std::allocator<scoped_refptr<IPC::MessageFilter> >,scoped_refptr<IPC::MessageFilter> *> [0x0EEFE42B+43]
	std::_Destroy_range<std::allocator<scoped_refptr<IPC::MessageFilter> >,scoped_refptr<IPC::MessageFilter> *> [0x0EEFE48A+26]
	std::vector<scoped_refptr<IPC::MessageFilter>,std::allocator<scoped_refptr<IPC::MessageFilter> > >::_Destroy [0x0EF0506D+29]
	std::vector<scoped_refptr<IPC::MessageFilter>,std::allocator<scoped_refptr<IPC::MessageFilter> > >::clear [0x0EF063EE+46]
	IPC::ChannelProxy::Context::OnChannelClosed [0x0EF0354B+395]
	IPC::SyncChannel::SyncContext::OnChannelClosed [0x0EF3C866+38]
	??$Invoke@ABV?$scoped_refptr@VContext@ChannelProxy@IPC@@@@$$V@?$FunctorTraits@P8Context@ChannelProxy@IPC@@AEXXZX@internal@base@@SAXP8Context@ChannelProxy@IPC@@AEXXZABV?$scoped_refptr@VContext@ChannelProxy@IPC@@@@@Z [0x0EEFD6B3+19]
	base::internal::InvokeHelper<0,void>::MakeItSo<void (__thiscall IPC::ChannelProxy::Context::*const &)(void),scoped_refptr<IPC::ChannelProxy::Context> const &> [0x0EEFDD98+40]
	base::internal::Invoker<base::internal::BindState<void (__thiscall IPC::ChannelProxy::Context::*)(void),scoped_refptr<IPC::ChannelProxy::Context> >,void __cdecl(void)>::RunImpl<void (__thiscall IPC::ChannelProxy::Context::*const &)(void),std::tuple<scoped [0x0EEFE184+52]
	base::internal::Invoker<base::internal::BindState<void (__thiscall IPC::ChannelProxy::Context::*)(void),scoped_refptr<IPC::ChannelProxy::Context> >,void __cdecl(void)>::Run [0x0EF04564+36]
	base::Callback<void __cdecl(void),0,0>::Run [0x1004A9F5+53]
	base::debug::TaskAnnotator::RunTask [0x100B54DC+476]
	base::MessageLoop::RunTask [0x1013AB1C+508]
	base::MessageLoop::DeferOrRunPendingTask [0x10138F92+50]
	base::MessageLoop::DoWork [0x101395E2+274]
	base::MessagePumpForIO::DoRunLoop [0x10141361+33]
	base::MessagePumpWin::Run [0x1014244B+123]
	base::MessageLoop::Run [0x1013A81F+191]
	base::RunLoop::Run [0x101FA32A+186]
	base::Thread::Run [0x1029ECC1+273]
	base::Thread::ThreadMain [0x1029FE0F+863]
	base::PlatformThread::Sleep [0x10276F5C+380]
	BaseThreadInitThunk [0x768F338A+18]
	RtlInitializeExceptionChain [0x77639902+99]
	RtlInitializeExceptionChain [0x776398D5+54]

Most likely caused by https://chromium-review.googlesource.com/c/538056/. I'm reverting the change.