diff -r 000000000000 -r 6474c204b198 xpcom/string/public/nsStringFwd.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/xpcom/string/public/nsStringFwd.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,63 @@
+/* -*- 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/. */
+
+/* nsStringFwd.h --- forward declarations for string classes */
+
+#ifndef nsStringFwd_h___
+#define nsStringFwd_h___
+
+#include "nscore.h"
+
+#ifndef MOZILLA_INTERNAL_API
+#error Internal string headers are not available from external-linkage code.
+#endif
+
+  /**
+   * double-byte (char16_t) string types
+   */
+
+class nsAString;
+class nsSubstringTuple;
+class nsString;
+class nsAutoString;
+class nsDependentString;
+class nsDependentSubstring;
+class nsPromiseFlatString;
+class nsStringComparator;
+class nsDefaultStringComparator;
+class nsXPIDLString;
+
+
+  /**
+   * single-byte (char) string types
+   */
+
+class nsACString;
+class nsCSubstringTuple;
+class nsCString;
+class nsAutoCString;
+class nsDependentCString;
+class nsDependentCSubstring;
+class nsPromiseFlatCString;
+class nsCStringComparator;
+class nsDefaultCStringComparator;
+class nsXPIDLCString;
+
+
+  /**
+   * typedefs for backwards compatibility
+   */
+
+typedef nsAString             nsSubstring;
+typedef nsACString            nsCSubstring;
+
+typedef nsString              nsAFlatString;
+typedef nsSubstring           nsASingleFragmentString;
+
+typedef nsCString             nsAFlatCString;
+typedef nsCSubstring          nsASingleFragmentCString;
+
+  
+#endif /* !defined(nsStringFwd_h___) */