PassRefPtr is stolen by first agent invocation.

Source/core/inspector/InspectorResourceAgent.cpp

Index: Source/core/inspector/InspectorResourceAgent.cpp
diff --git a/Source/core/inspector/InspectorResourceAgent.cpp b/Source/core/inspector/InspectorResourceAgent.cpp
index 6d841264b02bc24c7c3bc4430cd627e541f0b78b..29accb85010442651df65dff82a0fe634ed6914b 100644
--- a/Source/core/inspector/InspectorResourceAgent.cpp
+++ b/Source/core/inspector/InspectorResourceAgent.cpp
@@ -446,7 +446,7 @@ void InspectorResourceAgent::documentThreadableLoaderStartedLoadingForClient(uns
     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);