ActiveScriptWrappable: GC wrappers in detached ExecutionContexts.

third_party/WebKit/Source/core/xmlhttprequest/XMLHttpRequest.cpp

 /*
  *  Copyright (C) 2004, 2006, 2008 Apple Inc. All rights reserved.
  *  Copyright (C) 2005-2007 Alexey Proskuryakov <ap@webkit.org>
  *  Copyright (C) 2007, 2008 Julien Chaffraix <jchaffraix@webkit.org>
  *  Copyright (C) 2008, 2011 Google Inc. All rights reserved.
  *  Copyright (C) 2012 Intel Corporation
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Lesser General Public
  *  License as published by the Free Software Foundation; either
@@ skipping 205 matching lines @@
 XMLHttpRequest* XMLHttpRequest::create(ExecutionContext* context) {
   XMLHttpRequest* xmlHttpRequest = new XMLHttpRequest(context, nullptr);
   xmlHttpRequest->suspendIfNeeded();
 
   return xmlHttpRequest;
 }
 
 XMLHttpRequest::XMLHttpRequest(
     ExecutionContext* context,
     PassRefPtr<SecurityOrigin> isolatedWorldSecurityOrigin)
-    : ActiveScriptWrappable(this),
+    : ActiveScriptWrappable<XMLHttpRequest>(this),
       SuspendableObject(context),
       m_timeoutMilliseconds(0),
       m_responseBlob(this, nullptr),
       m_state(kUnsent),
       m_responseDocument(this, nullptr),
       m_lengthDownloadedToFile(0),
       m_responseArrayBuffer(this, nullptr),
       m_receivedLength(0),
       m_exceptionCode(0),
       m_progressEventThrottle(
@@ skipping 1610 matching lines @@
   visitor->traceWrappers(m_responseDocument);
   visitor->traceWrappers(m_responseArrayBuffer);
   XMLHttpRequestEventTarget::traceWrappers(visitor);
 }
 
 std::ostream& operator<<(std::ostream& ostream, const XMLHttpRequest* xhr) {
   return ostream << "XMLHttpRequest " << static_cast<const void*>(xhr);
 }
 
 }  // namespace blink