Reverted here: https://chromium-review.googlesource.com/c/chromium/src/+/1350912

Test still failing. A V8 binding CHECK failure suggests https://chromium-review.googlesource.com/c/chromium/src/+/1343881 might be the actual culprit.

[1:1:1126/054258.647562:FATAL:binding_security.cc(354)] Check failed: accessing_world.GetWorldId() == target_world.GetWorldId() (4 vs. 0)
    #0 0x5584a55f9681 in __interceptor_backtrace /b/swarming/w/ir/kitchen-workdir/src/third_party/llvm/compiler-rt/lib/msan/../sanitizer_common/sanitizer_common_interceptors.inc:4041:13
    #1 0x5584bb0af97a in base::debug::StackTrace::StackTrace(unsigned long) ./../../base/debug/stack_trace_posix.cc:833:41
    #2 0x5584badaf9ea in logging::LogMessage::~LogMessage() ./../../base/logging.cc:592:29
    #3 0x5584cbf6d75a in ShouldAllowAccessToV8ContextInternal<blink::BindingSecurityForPlatform::ErrorReportOption> ./../../third_party/blink/renderer/bindings/core/v8/binding_security.cc:354:3
    #4 0x5584cbf6d75a in blink::BindingSecurity::ShouldAllowAccessToV8Context(v8::Local<v8::Context>, v8::Local<v8::Context>, blink::BindingSecurityForPlatform::ErrorReportOption) ./../../third_party/blink/renderer/bindings/core/v8/binding_security.cc:375:0
    #5 0x5584cccdeb81 in blink::CallbackFunctionBase::CallbackFunctionBase(v8::Local<v8::Object>) ./../../third_party/blink/renderer/platform/bindings/callback_function_base.cc:26:7
    #6 0x5584d67523bb in V8EventHandlerNonNull ./gen/third_party/blink/renderer/bindings/core/v8/v8_event_handler_non_null.h:29:9
    #7 0x5584d67523bb in Construct<v8::Local<v8::Object> &> ./../../third_party/blink/renderer/platform/heap/heap.h:540:0
    #8 0x5584d67523bb in MakeGarbageCollected<blink::V8EventHandlerNonNull, v8::Local<v8::Object> &> ./../../third_party/blink/renderer/platform/heap/heap.h:559:0
    #9 0x5584d67523bb in Create ./gen/third_party/blink/renderer/bindings/core/v8/v8_event_handler_non_null.h:25:0
    #10 0x5584d67523bb in blink::JSEventHandler::SetCompiledHandler(blink::ScriptState*, v8::Local<v8::Function>, blink::V8PrivateProperty::Symbol const&) ./../../third_party/blink/renderer/bindings/core/v8/js_event_handler.cc:40:0
    #11 0x5584d6759648 in blink::JSEventHandlerForContentAttribute::GetCompiledHandler(blink::EventTarget&) ./../../third_party/blink/renderer/bindings/core/v8/js_event_handler_for_content_attribute.cc:191:3
    #12 0x5584d6757329 in blink::JSEventHandlerForContentAttribute::GetListenerObject(blink::EventTarget&) ./../../third_party/blink/renderer/bindings/core/v8/js_event_handler_for_content_attribute.cc:26:10
    #13 0x5584d67506a1 in blink::JSBasedEventListener::Invoke(blink::ExecutionContext*, blink::Event*) ./../../third_party/blink/renderer/bindings/core/v8/js_based_event_listener.cc:81:37
    #14 0x5584ce010a40 in blink::EventTarget::FireEventListeners(blink::Event&, blink::EventTargetData*, blink::HeapVector<blink::RegisteredEventListener, 1u>&) ./../../third_party/blink/renderer/core/dom/events/event_target.cc:850:15
    #15 0x5584ce00d560 in blink::EventTarget::FireEventListeners(blink::Event&) ./../../third_party/blink/renderer/core/dom/events/event_target.cc:695:29
    #16 0x5584cdfd07f7 in DispatchEventAtTarget ./../../third_party/blink/renderer/core/dom/events/event_dispatcher.cc:270:29
    #17 0x5584cdfd07f7 in blink::EventDispatcher::Dispatch() ./../../third_party/blink/renderer/core/dom/events/event_dispatcher.cc:210:0
    #18 0x5584cdfcddd7 in blink::EventDispatcher::DispatchSimulatedClick(blink::Node&, blink::Event*, blink::SimulatedClickMouseEventOptions, blink::SimulatedClickCreationScope) ./../../third_party/blink/renderer/core/dom/events/event_dispatcher.cc:123:8
    #19 0x5584cc2cf9d6 in ClickMethod ./gen/third_party/blink/renderer/bindings/core/v8/v8_html_element.cc:2701:9
    #20 0x5584cc2cf9d6 in blink::V8HTMLElement::ClickMethodCallback(v8::FunctionCallbackInfo<v8::Value> const&) ./gen/third_party/blink/renderer/bindings/core/v8/v8_html_element.cc:4209:0
    #21 0x5584b60b5a9d in v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo*) ./../../v8/src/api-arguments-inl.h:146:3
    #22 0x5584b60b1b05 in v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) ./../../v8/src/builtins/builtins-api.cc:109:36
    #23 0x5584b60ae081 in v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) ./../../v8/src/builtins/builtins-api.cc:139:5
    #24 0x5584b86eaecf in v8::internal::Simulator::DoRuntimeCall(v8::internal::Instruction*) ./../../v8/src/arm64/simulator-arm64.cc:539:11
    #25 0x5584b86ea4cc in v8::internal::Simulator::ExecuteInstruction() ./../../v8/src/arm64/simulator-arm64.h:779:5
    #26 0x5584b86ea29f in v8::internal::Simulator::Run() ./../../v8/src/arm64/simulator-arm64.cc:390:5

I think that https://chromium-review.googlesource.com/c/chromium/src/+/1351424 fixed this issue.