PassRefPtr is stolen by first agent invocation.

Source/core/inspector/InspectorResourceAgent.cpp

 /*
  * Copyright (C) 2011 Google 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 428 matching lines @@
 
     PendingXHRReplayDataMap::iterator it = m_pendingXHRReplayData.find(client);
     if (it == m_pendingXHRReplayData.end())
         return;
 
     XHRReplayData* xhrReplayData = it->value.get();
     String requestId = IdentifiersFactory::requestId(identifier);
     m_resourcesData->setXHRReplayData(requestId, xhrReplayData);
 }
 
-void InspectorResourceAgent::willLoadXHR(XMLHttpRequest* xhr, ThreadableLoaderClient* client, const AtomicString& method, const KURL& url, bool async, PassRefPtr<FormData> formData, const HTTPHeaderMap& headers, bool includeCredentials)
+void InspectorResourceAgent::willLoadXHR(XMLHttpRequest* xhr, ThreadableLoaderClient* client, const AtomicString& method, const KURL& url, bool async, FormData* formData, const HTTPHeaderMap& headers, bool includeCredentials)
 {
     ASSERT(xhr);
     RefPtr<XHRReplayData> xhrReplayData = XHRReplayData::create(xhr->executionContext(), method, urlWithoutFragment(url), async, formData, includeCredentials);
     HTTPHeaderMap::const_iterator end = headers.end();
     for (HTTPHeaderMap::const_iterator it = headers.begin(); it!= end; ++it)
         xhrReplayData->addHeader(it->key, it->value);
     m_pendingXHRReplayData.set(client, xhrReplayData);
 }
 
 void InspectorResourceAgent::didFailXHRLoading(XMLHttpRequest*, ThreadableLoaderClient* client)
@@ skipping 350 matching lines @@
     : InspectorBaseAgent<InspectorResourceAgent>("Network")
     , m_pageAgent(pageAgent)
     , m_client(client)
     , m_frontend(0)
     , m_resourcesData(adoptPtr(new NetworkResourcesData()))
     , m_isRecalculatingStyle(false)
 {
 }
 
 } // namespace WebCore