Fakiness dashboard:
  https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=singletap-on-overlay-closes-overflow-menu.html

Example build:
  https://ci.chromium.org/buildbot/chromium.webkit/WebKit%20Linux%20Trusty%20(dbg)/12155

STDERR: [1:1:0501/232845.141631:FATAL:media_control_overflow_menu_list_element.cc(58)] Check failed: !current_task_handle_.IsActive(). 
STDERR: #0 0x7fc621b8f82d base::debug::StackTrace::StackTrace()
STDERR: #1 0x7fc6218ba54c base::debug::StackTrace::StackTrace()
STDERR: #2 0x7fc62192bf3a logging::LogMessage::~LogMessage()
STDERR: #3 0x7fc60e3e8d98 blink::MediaControlOverflowMenuListElement::SetIsWanted()
STDERR: #4 0x7fc60e3eeda0 blink::MediaControlPopupMenuElement::RemovedFrom()
STDERR: #5 0x7fc611be0f0d blink::ContainerNode::NotifyNodeRemoved()
STDERR: #6 0x7fc611be0f41 blink::ContainerNode::NotifyNodeRemoved()
STDERR: #7 0x7fc611be1152 blink::ContainerNode::RemoveChildren()
STDERR: #8 0x7fc611cf20e6 blink::Node::setTextContent()
STDERR: #9 0x7fc612e6988c blink::NodeV8Internal::textContentAttributeSetter()
STDERR: #10 0x7fc612e69776 blink::V8Node::textContentAttributeSetterCallback()
STDERR: #11 0x7fc613fe7043 v8::internal::FunctionCallbackArguments::Call()
STDERR: #12 0x7fc613fe533e v8::internal::(anonymous namespace)::HandleApiCallHelper<>()
STDERR: #13 0x7fc613fe3f95 v8::internal::Builtins::InvokeApiFunction()
STDERR: #14 0x7fc61458d95a v8::internal::Object::SetPropertyWithAccessor()
STDERR: #15 0x7fc6145a5be6 v8::internal::Object::SetPropertyInternal()
STDERR: #16 0x7fc6145a58b8 v8::internal::Object::SetProperty()
STDERR: #17 0x7fc61448b8a5 v8::internal::StoreIC::Store()
STDERR: #18 0x7fc614493586 v8::internal::__RT_impl_Runtime_StoreIC_Miss()
STDERR: #19 0x1546ca18f818 <unknown>