ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/core/dom/MessagePort.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 34 matching lines @@
 class ExceptionState;
 class ExecutionContext;
 class MessagePort;
 class SerializedScriptValue;
 
 // Not to be confused with WebMessagePortChannelArray; this one uses Vector and
 // std::unique_ptr instead of WebVector and raw pointers.
 typedef Vector<WebMessagePortChannelUniquePtr, 1> MessagePortChannelArray;
 
 class CORE_EXPORT MessagePort : public EventTargetWithInlineData,
-                                public ActiveScriptWrappable,
+                                public ActiveScriptWrappable<MessagePort>,
                                 public SuspendableObject,
                                 public WebMessagePortChannelClient {
   DEFINE_WRAPPERTYPEINFO();
   USING_GARBAGE_COLLECTED_MIXIN(MessagePort);
 
  public:
   static MessagePort* create(ExecutionContext&);
   ~MessagePort() override;
 
   void postMessage(ExecutionContext*,
@@ skipping 76 matching lines @@
 
   WebMessagePortChannelUniquePtr m_entangledChannel;
 
   bool m_started;
   bool m_closed;
 };
 
 }  // namespace blink
 
 #endif  // MessagePort_h