bindings: Use Maybe version of Call()

Source/bindings/core/v8/V8AbstractEventListener.h

Index: Source/bindings/core/v8/V8AbstractEventListener.h
diff --git a/Source/bindings/core/v8/V8AbstractEventListener.h b/Source/bindings/core/v8/V8AbstractEventListener.h
index bdbd3c5118209cdb76b996050da14410a10bcdfb..6b5d1cb615890d471d5003976855a1f6b14bed98 100644
--- a/Source/bindings/core/v8/V8AbstractEventListener.h
+++ b/Source/bindings/core/v8/V8AbstractEventListener.h
@@ -128,6 +128,8 @@ private:
     // Implementation of EventListener function.
     virtual bool virtualisAttribute() const override { return m_isAttribute; }
 
+    // This could return an empty handle and callers need to check return value.
+    // We don't use v8::MaybeLocal because it can fail without exception.
     virtual v8::Local<v8::Value> callListenerFunction(ScriptState*, v8::Local<v8::Value> jsevent, Event*) = 0;
 
     virtual bool shouldPreventDefault(v8::Local<v8::Value> returnValue);