Bug 258356

fast/editing/document-leak-altered-text-field.html is a flaky crash:
ASSERTION FAILED: unifiedTextCheckerEnabled()
/Volumes/Data/worker/macOS-AppleSilicon-Ventura-Debug-Build-EWS/build/Source/WebCore/editing/Editor.cpp(2829) : void WebCore::Editor::markAllMisspellingsAndBadGrammarInRanges(OptionSet<WebCore::TextCheckingType>, const std::optional<SimpleRange> &, const std::optional<SimpleRange> &, const std::optional<SimpleRange> &)
1   0x135ad3adc WTFCrash
2   0x283f31d10 WebCore::NetworkResourcesData::ResourceData::hasContent() const
3   0x283959a38 WebCore::Editor::markAllMisspellingsAndBadGrammarInRanges(WTF::OptionSet<WebCore::TextCheckingType>, std::__1::optional<WebCore::SimpleRange> const&, std::__1::optional<WebCore::SimpleRange> const&, std::__1::optional<WebCore::SimpleRange> const&)
4   0x2838f573c WebCore::AlternativeTextController::timerFired()
5   0x28391ab54 decltype(*std::declval<WebCore::AlternativeTextController*&>().*std::declval<void (WebCore::AlternativeTextController::*&)()>()()) std::__1::__invoke[abi:v15006]<void (WebCore::AlternativeTextController::*&)(), WebCore::AlternativeTextController*&, void>(void (WebCore::AlternativeTextController::*&)(), WebCore::AlternativeTextController*&)
6   0x28391aad4 std::__1::__bind_return<void (WebCore::AlternativeTextController::*)(), std::__1::tuple<WebCore::AlternativeTextController*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::AlternativeTextController::*)(), std::__1::tuple<WebCore::AlternativeTextController*>, std::__1::tuple<>>::value>::type std::__1::__apply_functor[abi:v15006]<void (WebCore::AlternativeTextController::*)(), std::__1::tuple<WebCore::AlternativeTextController*>, 0ul, std::__1::tuple<>>(void (WebCore::AlternativeTextController::*&)(), std::__1::tuple<WebCore::AlternativeTextController*>&, std::__1::__tuple_indices<0ul>, std::__1::tuple<>&&)
7   0x28391aa8c std::__1::__bind_return<void (WebCore::AlternativeTextController::*)(), std::__1::tuple<WebCore::AlternativeTextController*>, std::__1::tuple<>, __is_valid_bind_return<void (WebCore::AlternativeTextController::*)(), std::__1::tuple<WebCore::AlternativeTextController*>, std::__1::tuple<>>::value>::type std::__1::__bind<void (WebCore::AlternativeTextController::*&)(), WebCore::AlternativeTextController*>::operator()[abi:v15006]<>()
8   0x28391aa30 WTF::Detail::CallableWrapper<std::__1::__bind<void (WebCore::AlternativeTextController::*&)(), WebCore::AlternativeTextController*>, void>::call()
9   0x2800265b4 WTF::Function<void ()>::operator()() const
10  0x282dfefac WebCore::Timer::fired()
11  0x284774d98 WebCore::ThreadTimers::sharedTimerFiredInternal()
12  0x28477d270 WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0::operator()() const
13  0x28477d21c WTF::Detail::CallableWrapper<WebCore::ThreadTimers::setSharedTimer(WebCore::SharedTimer*)::$_0, void>::call()
14  0x2800265b4 WTF::Function<void ()>::operator()() const
15  0x28471e624 WebCore::MainThreadSharedTimer::fired()