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diff --git a/comm/mailnews/base/src/MailNewsDLF.h b/comm/mailnews/base/src/MailNewsDLF.h
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+++ b/comm/mailnews/base/src/MailNewsDLF.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef MailNewsDLF_h__
+#define MailNewsDLF_h__
+
+#include "nsIDocumentLoaderFactory.h"
+#include "nsMimeTypes.h"
+
+namespace mozilla {
+namespace mailnews {
+
+/*
+ * This factory is a thin wrapper around the text/html loader factory. All it
+ * does is convert message/rfc822 to text/html and delegate the rest of the
+ * work to the text/html factory.
+ */
+class MailNewsDLF : public nsIDocumentLoaderFactory {
+ public:
+  MailNewsDLF();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIDOCUMENTLOADERFACTORY
+
+ private:
+  virtual ~MailNewsDLF();
+};
+}  // namespace mailnews
+}  // namespace mozilla
+
+#define MAILNEWSDLF_CATEGORIES              \
+  {"Gecko-Content-Viewers", MESSAGE_RFC822, \
+   "@mozilla.org/mailnews/document-loader-factory;1"},
+
+#endif