Disable memory caching of XHRs

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 1004 matching lines @@
   resourceLoaderOptions.securityOrigin = getSecurityOrigin();
 
   // When responseType is set to "blob", we redirect the downloaded data to a
   // file-handle directly.
   m_downloadingToFile = getResponseTypeCode() == ResponseTypeBlob;
   if (m_downloadingToFile) {
     request.setDownloadToFile(true);
     resourceLoaderOptions.dataBufferingPolicy = DoNotBufferData;
   }
 
+  if (m_async) {
+    resourceLoaderOptions.dataBufferingPolicy = DoNotBufferData;
+  }
+
   m_exceptionCode = 0;
   m_error = false;
 
   if (m_async) {
     UseCounter::count(&executionContext,
                       UseCounter::XMLHttpRequestAsynchronous);
     if (m_upload)
       request.setReportUploadProgress(true);
 
     DCHECK(!m_loader);
@@ skipping 806 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