Add a pre-finalizer for XHR to cancel the loader

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 1086 matching lines @@
         m_state == kLoading) {
       DCHECK(!m_loader);
       handleRequestError(0, EventTypeNames::abort, receivedLength,
                          expectedLength);
     }
   }
   if (m_state == kDone)
     m_state = kUnsent;
 }
 
+void XMLHttpRequest::dispose() {
+  if (m_loader) {
+    m_error = true;
+    m_loader->cancel();
+  }
+}
+
 void XMLHttpRequest::clearVariablesForLoading() {
   if (m_blobLoader) {
     m_blobLoader->cancel();
     m_blobLoader = nullptr;
   }
 
   m_decoder.reset();
 
   if (m_responseDocumentParser) {
     m_responseDocumentParser->removeClient(this);
@@ skipping 743 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