Fix crash in AsyncCallTracker::didEnqueueMutationRecord

Source/core/inspector/AsyncCallTracker.cpp

Index: Source/core/inspector/AsyncCallTracker.cpp
diff --git a/Source/core/inspector/AsyncCallTracker.cpp b/Source/core/inspector/AsyncCallTracker.cpp
index 256fdcc3ed3006f6ac2b8fe846cec3516d4d5a32..bbaed4b924e4e45fc556141117fe2807b558028a 100644
--- a/Source/core/inspector/AsyncCallTracker.cpp
+++ b/Source/core/inspector/AsyncCallTracker.cpp
@@ -310,6 +310,9 @@ void AsyncCallTracker::didEnqueueMutationRecord(ExecutionContext* context, Mutat
     ExecutionContextData* data = createContextDataIfNeeded(context);
     if (data->m_mutationObserverCallChains.contains(observer))
         return;
+    Optional<ScriptForbiddenScope::AllowUserAgentScript> allowScripting;
+    if (isMainThread())
+        allowScripting.emplace();
     int operationId = m_debuggerAgent->traceAsyncOperationStarting(enqueueMutationRecordName);
     data->m_mutationObserverCallChains.set(observer, operationId);
 }