Remove support for multipart/x-mixed-replace

Source/core/loader/ResourceLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2010, 2011 Apple Inc. All rights reserved.
  *           (C) 2007 Graham Dennis (graham.dennis@gmail.com)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer. 
@@ skipping 304 matching lines @@
     // Reference the object in this method since the additional processing can do
     // anything including removing the last reference to this object.
     RefPtr<ResourceLoader> protect(this);
     m_resource->responseReceived(response);
     if (m_state == Terminated)
         return;
 
     if (m_options.sendLoadCallbacks == SendCallbacks)
         frameLoader()->notifier()->dispatchDidReceiveResponse(m_documentLoader.get(), m_resource->identifier(), response);
 
-    // FIXME: Main resources have a different set of rules for multipart than images do.
-    // Hopefully we can merge those 2 paths.
-    if (response.isMultipart() && m_resource->type() != CachedResource::MainResource) {
+    if (response.isMultipart()) {
         m_loadingMultipartContent = true;
 
         // We don't count multiParts in a CachedResourceLoader's request count
         m_requestCountTracker.clear();
         if (!m_resource->isImage()) {
             cancel();
             return;
         }
     } else if (m_loadingMultipartContent) {
         // Since a subresource loader does not load multipart sections progressively, data was delivered to the loader all at once.
@@ skipping 85 matching lines @@
     info.addMember(m_request, "request");
     info.addMember(m_originalRequest, "originalRequest");
     info.addMember(m_deferredRequest, "deferredRequest");
     info.addMember(m_options, "options");
     info.addMember(m_resource, "resource");
     info.addMember(m_documentLoader, "documentLoader");
     info.addMember(m_requestCountTracker, "requestCountTracker");
 }
 
 }