diff -r 000000000000 -r 6474c204b198 xpcom/ds/nsPersistentProperties.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/ds/nsPersistentProperties.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,67 @@
+/* -*- 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 nsPersistentProperties_h___
+#define nsPersistentProperties_h___
+
+#include "nsIPersistentProperties2.h"
+#include "pldhash.h"
+#include "plarena.h"
+#include "nsString.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Attributes.h"
+
+class nsIUnicharInputStream;
+
+class nsPersistentProperties MOZ_FINAL : public nsIPersistentProperties
+{
+public:
+  nsPersistentProperties();
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIPROPERTIES
+  NS_DECL_NSIPERSISTENTPROPERTIES
+
+  static nsresult
+  Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+private:
+  ~nsPersistentProperties();
+
+protected:
+  nsCOMPtr<nsIUnicharInputStream> mIn;
+
+  nsIPersistentProperties* mSubclass;
+  struct PLDHashTable mTable;
+  PLArenaPool mArena;
+};
+
+class nsPropertyElement MOZ_FINAL : public nsIPropertyElement
+{
+public:
+  nsPropertyElement()
+  {
+  }
+
+  nsPropertyElement(const nsACString& aKey, const nsAString& aValue)
+    : mKey(aKey), mValue(aValue)
+  {
+  }
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIPROPERTYELEMENT
+
+  static NS_METHOD
+  Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+private:
+  ~nsPropertyElement() {}
+
+protected:
+  nsCString mKey;
+  nsString mValue;
+};
+
+#endif /* nsPersistentProperties_h___ */