Enable brand codes and master preferences on the Mac.

chrome/browser/mac/master_prefs.h

Index: chrome/browser/mac/master_prefs.h
diff --git a/chrome/browser/mac/master_prefs.h b/chrome/browser/mac/master_prefs.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_MAC_MASTER_PREFS_H_
+#define CHROME_BROWSER_MAC_MASTER_PREFS_H_
+#pragma once
+
+#include "base/file_path.h"
+
+namespace master_prefs {
+
+// Returns the path to the master preferences file. Note that this path may be
+// empty (in the case where this type of build cannot have a master preferences
+// file) or may not actually exist on the filesystem.
+FilePath MasterPrefsPath();
+
+}  // namespace master_prefs
+
+#endif  // CHROME_BROWSER_MAC_MASTER_PREFS_H_