Enable brand codes and master preferences on the Mac.

chrome/browser/mac/master_prefs.mm

Index: chrome/browser/mac/master_prefs.mm
diff --git a/chrome/browser/mac/master_prefs.mm b/chrome/browser/mac/master_prefs.mm
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+++ b/chrome/browser/mac/master_prefs.mm
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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.
+
+#include "chrome/browser/mac/master_prefs.h"
+
+#include "base/mac/foundation_util.h"
+#include "chrome/common/chrome_version_info.h"
+
+#if defined(GOOGLE_CHROME_BUILD)
+
+namespace {
+
+const char kGoogleDirectory[] = "Google";
+const char kMasterPreferencesFileName[] = "Google Chrome Master Preferences";
+
+}  // namespace
+
+#endif  // GOOGLE_CHROME_BUILD
+
+namespace master_prefs {
+
+FilePath MasterPrefsPath() {
+#if defined(GOOGLE_CHROME_BUILD)
+  // There is only a system-level master preferences file, and only for the
+  // official build, and not for the canary.
+  chrome::VersionInfo::Channel channel = chrome::VersionInfo::GetChannel();
+
+  if (channel == chrome::VersionInfo::CHANNEL_CANARY)
+    return FilePath();
+
+  FilePath library_path;
+  if (!base::mac::GetLocalDirectory(NSLibraryDirectory, &library_path))
+    return FilePath();
+
+  return library_path.Append(kGoogleDirectory)
+                     .Append(kMasterPreferencesFileName);
+#else
+  return FilePath();
+#endif  // GOOGLE_CHROME_BUILD
+}
+
+}  // namespace master_prefs