[ServiceWorker] Fix ExtendableMessageEvent idl binding

third_party/WebKit/Source/modules/serviceworkers/ExtendableMessageEvent.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ExtendableMessageEvent_h
 #define ExtendableMessageEvent_h
 
 #include "modules/EventModules.h"
 #include "modules/ModulesExport.h"
 #include "modules/serviceworkers/ExtendableEvent.h"
@@ skipping 28 matching lines @@
                                         WaitUntilObserver*);
 
   SerializedScriptValue* SerializedData() const {
     return serialized_data_.Get();
   }
   void SetSerializedData(PassRefPtr<SerializedScriptValue> serialized_data) {
     serialized_data_ = std::move(serialized_data);
   }
   const String& origin() const { return origin_; }
   const String& lastEventId() const { return last_event_id_; }
-  MessagePortArray ports(bool& is_null) const;
   MessagePortArray ports() const;
   void source(ClientOrServiceWorkerOrMessagePort& result) const;
 
   const AtomicString& InterfaceName() const override;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   ExtendableMessageEvent(const AtomicString& type,
                          const ExtendableMessageEventInit& initializer);
@@ skipping 10 matching lines @@
   String last_event_id_;
   Member<ServiceWorkerClient> source_as_client_;
   Member<ServiceWorker> source_as_service_worker_;
   Member<MessagePort> source_as_message_port_;
   Member<MessagePortArray> ports_;
 };
 
 }  // namespace blink
 
 #endif  // ExtendableMessageEvent_h