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diff --git a/src/libs/xpcom18a4/xpcom/io/nsFastLoadPtr.h b/src/libs/xpcom18a4/xpcom/io/nsFastLoadPtr.h
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+++ b/src/libs/xpcom18a4/xpcom/io/nsFastLoadPtr.h
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla FastLoad code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Brendan Eich <brendan@mozilla.org> (original author)
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef nsFastLoadPtr_h___
+#define nsFastLoadPtr_h___
+
+/**
+ * Mozilla FastLoad file object pointer template type.
+ *
+ * Use nsFastLoadPtr<T> rather than nsCOMPtr<T> when declaring a strong XPCOM
+ * ref member of a data structure that's conditionally loaded at application
+ * startup.  You must be willing to tolerate the null mRawPtr test on every
+ * dereference of this member pointer, or else copy it to a local to optimize
+ * away the cost.
+ */
+
+#ifndef nsCOMPtr_h___
+#include "nsCOMPtr.h"
+#endif
+
+#ifndef nsIFastLoadService_h___
+#include "nsIFastLoadService.h"
+#endif
+
+#ifdef VBOX_WITH_XPCOM_NAMESPACE_CLEANUP
+#define gFastLoadService_ VBoxNsxpgFastLoadService_
+#endif /* VBOX_WITH_XPCOM_NAMESPACE_CLEANUP */
+
+/**
+ * nsFastLoadPtr is a template class, so we don't want a class static service
+ * pointer member declared in nsFastLoadPtr, above.  Plus, we need special
+ * declaration magic to export data across DLL/DSO boundaries.  So we use an
+ * old-fashioned global variable that refers weakly to the one true FastLoad
+ * service.  This pointer is maintained by that singleton's ctor and dtor.
+ */
+PR_EXPORT_DATA(nsIFastLoadService*) gFastLoadService_;
+
+template <class T>
+class nsFastLoadPtr : public nsCOMPtr<T> {
+  public:
+    nsDerivedSafe<T>* get() const {
+        if (!this->mRawPtr) {
+            gFastLoadService_->GetFastLoadReferent(
+                                         NS_REINTERPRET_CAST(nsISupports**,
+                                                             &this->mRawPtr));
+        }
+        return NS_REINTERPRET_CAST(nsDerivedSafe<T>*, this->mRawPtr);
+    }
+
+    /**
+     * Deserialize an nsFastLoadPtr from aInputStream, skipping the referent
+     * object, but saving the object's offset for later deserialization.
+     *
+     * Lowercase name _a la_ get, because it's called the same way -- not via
+     * operator->().
+     */
+    nsresult read(nsIObjectInputStream* aInputStream) {
+        return gFastLoadService_->ReadFastLoadPtr(aInputStream,
+                                         NS_REINTERPRET_CAST(nsISupports**,
+                                                             &this->mRawPtr));
+    }
+
+    /**
+     * Serialize an nsFastLoadPtr reference and possibly the referent object,
+     * if that object has not yet been serialized.
+     *
+     * Lowercase name _a la_ get, because it's called the same way -- not via
+     * operator->().
+     */
+    nsresult write(nsIObjectOutputStream* aOutputStream) {
+        return gFastLoadService_->WriteFastLoadPtr(aOutputStream,
+                                          NS_REINTERPRET_CAST(nsISupports*,
+                                                              this->mRawPtr));
+    }
+};
+
+#endif // nsFastLoadPtr_h___