diff -r 000000000000 -r 6474c204b198 modules/libpref/src/prefapi_private_data.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/modules/libpref/src/prefapi_private_data.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C; tab-width: 4; 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/. */
+
+/* Data shared between prefapi.c and nsPref.cpp */
+
+#ifndef prefapi_private_data_h
+#define prefapi_private_data_h
+
+#include "mozilla/MemoryReporting.h"
+
+extern PLDHashTable			gHashTable;
+extern bool                 gDirty;
+
+namespace mozilla {
+namespace dom {
+class PrefSetting;
+}
+}
+
+enum pref_SaveTypes { SAVE_NONSHARED, SAVE_SHARED, SAVE_ALL, SAVE_ALL_AND_DEFAULTS };
+
+// Passed as the arg to pref_savePref
+struct pref_saveArgs {
+  char **prefArray;
+  pref_SaveTypes saveTypes;
+};
+
+PLDHashOperator
+pref_savePref(PLDHashTable *table, PLDHashEntryHdr *heh, uint32_t i, void *arg);
+
+PLDHashOperator
+pref_GetPrefs(PLDHashTable *table,
+              PLDHashEntryHdr *heh, uint32_t i, void *arg);
+
+nsresult
+pref_SetPref(const mozilla::dom::PrefSetting& aPref);
+
+int pref_CompareStrings(const void *v1, const void *v2, void* unused);
+PrefHashEntry* pref_HashTableLookup(const void *key);
+
+void pref_GetPrefFromEntry(PrefHashEntry *aHashEntry,
+                           mozilla::dom::PrefSetting* aPref);
+
+size_t
+pref_SizeOfPrivateData(mozilla::MallocSizeOf aMallocSizeOf);
+
+#endif