The second argument of add/removeEventListener should be an object, null, or undefined

third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp

Index: third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
diff --git a/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp b/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
index 3b6c2df83f94cd21beeb68eb8040167ae23f16bb..9e758ee5f004ec6ebaba6b2b39824eef6c2c7d51 100644
--- a/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
+++ b/third_party/WebKit/Source/core/inspector/ThreadDebugger.cpp
@@ -343,10 +343,11 @@ void ThreadDebugger::setMonitorEventsCallback(
   if (!eventTarget)
     return;
   Vector<String> types = normalizeEventTypes(info);
+  NonThrowableExceptionState exceptionState;
   EventListener* eventListener = V8EventListenerHelper::getEventListener(
       ScriptState::current(info.GetIsolate()),
       v8::Local<v8::Function>::Cast(info.Data()), false,
-      enabled ? ListenerFindOrCreate : ListenerFindOnly);
+      enabled ? ListenerFindOrCreate : ListenerFindOnly, exceptionState);
   if (!eventListener)
     return;
   for (size_t i = 0; i < types.size(); ++i) {