Move onc and proxy pref names to components.

components/onc/onc_pref_names.h

+// Copyright 2016 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 COMPONENTS_ONC_PREF_NAMES_H_
+#define COMPONENTS_ONC_PREF_NAMES_H_
+
+#include "components/onc/onc_export.h"
+
+class PrefRegistrySimple;
+
+namespace user_prefs {
+class PrefRegistrySyncable;
+}
+
+namespace onc {
+
+namespace prefs {
+
+ONC_EXPORT extern const char kDeviceOpenNetworkConfiguration[];
+ONC_EXPORT extern const char kOpenNetworkConfiguration[];
+
+}  // namespace prefs
+
+ONC_EXPORT void RegisterPrefs(PrefRegistrySimple* registry);
+
+ONC_EXPORT void RegisterProfilePrefs(
+    user_prefs::PrefRegistrySyncable* registry);
+
+}  // namespace onc
+
+#endif  // COMPONENTS_ONC_PREF_NAMES_H_