[Resource Timing] Fix potential double free problem

Source/core/fetch/ResourceFetcher.cpp

 /*
     Copyright (C) 1998 Lars Knoll (knoll@mpi-hd.mpg.de)
     Copyright (C) 2001 Dirk Mueller (mueller@kde.org)
     Copyright (C) 2002 Waldo Bastian (bastian@kde.org)
     Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
     Copyright (C) 2009 Torch Mobile Inc. http://www.torchmobile.com/
 
     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Library General Public
     License as published by the Free Software Foundation; either
@@ skipping 929 matching lines @@
     RefPtr<Document> protectDocument(m_document);
 
     if (resource && resource->response().isHTTP() && ((!resource->errorOccurred() && !resource->wasCanceled()) || resource->response().httpStatusCode() == 304) && document()) {
         ResourceTimingInfoMap::iterator it = m_resourceTimingInfoMap.find(resource);
         if (it != m_resourceTimingInfoMap.end()) {
             Document* initiatorDocument = document();
             if (resource->type() == Resource::MainResource)
                 initiatorDocument = document()->parentDocument();
             ASSERT(initiatorDocument);
             RefPtr<ResourceTimingInfo> info = it->value;
+            m_resourceTimingInfoMap.remove(it);
             info->setInitialRequest(resource->resourceRequest());
             info->setFinalResponse(resource->response());
             info->setLoadFinishTime(resource->loadFinishTime());
             if (DOMWindow* initiatorWindow = initiatorDocument->domWindow())
                 initiatorWindow->performance()->addResourceTiming(*info, initiatorDocument);
-            m_resourceTimingInfoMap.remove(it);
         }
     }
 
     if (frame())
         frame()->loader()->loadDone();
     performPostLoadActions();
 
     if (!m_garbageCollectDocumentResourcesTimer.isActive())
         m_garbageCollectDocumentResourcesTimer.startOneShot(0);
 }
@@ skipping 321 matching lines @@
 }
 #endif
 
 const ResourceLoaderOptions& ResourceFetcher::defaultResourceOptions()
 {
     DEFINE_STATIC_LOCAL(ResourceLoaderOptions, options, (SendCallbacks, SniffContent, BufferData, AllowStoredCredentials, ClientRequestedCredentials, AskClientForCrossOriginCredentials, DoSecurityCheck, CheckContentSecurityPolicy, UseDefaultOriginRestrictionsForType, DocumentContext));
     return options;
 }
 
 }