Avoid reusing XMLHttpRequest resources during document load.

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 842 matching lines @@
     // with this one, or vice versa, re-fetch the resource.
     //
     // This helps with the case where the server sends back
     // "Access-Control-Allow-Origin: *" all the time, but some of the
     // client's requests are made without CORS and some with.
     if (existingResource->resourceRequest().allowCookies() != request.allowCookies()) {
         LOG(ResourceLoading, "ResourceFetcher::determineRevalidationPolicy reloading due to difference in credentials settings.");
         return Reload;
     }
 
-    // During the initial load, avoid loading the same resource multiple times for a single document, even if the cache policies would tell us to.
-    if (document() && !document()->loadEventFinished() && m_validatedURLs.contains(existingResource->url()))
+    // During the initial load, avoid loading the same resource multiple times for a single document,
+    // even if the cache policies would tell us to. Raw resources are exempted.
+    if (type != Resource::Raw && document() && !document()->loadEventFinished() && m_validatedURLs.contains(existingResource->url()))
         return Use;
 
     // CachePolicyReload always reloads
     if (context().cachePolicy(type) == CachePolicyReload) {
         LOG(ResourceLoading, "ResourceFetcher::determineRevalidationPolicy reloading due to CachePolicyReload.");
         return Reload;
     }
 
     // We'll try to reload the resource if it failed last time.
     if (existingResource->errorOccurred()) {
@@ skipping 445 matching lines @@
 }
 #endif
 
 const ResourceLoaderOptions& ResourceFetcher::defaultResourceOptions()
 {
     DEFINE_STATIC_LOCAL(ResourceLoaderOptions, options, (SendCallbacks, SniffContent, BufferData, AllowStoredCredentials, ClientRequestedCredentials, AskClientForCrossOriginCredentials, DoSecurityCheck, CheckContentSecurityPolicy, UseDefaultOriginRestrictionsForType, DocumentContext));
     return options;
 }
 
 }