Moved prefs::kUserPolicyRefreshRate to component/policy/policy_pref_names.

components/policy/core/common/policy_pref_names.h

 // Copyright 2013 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_POLICY_CORE_COMMON_POLICY_PREF_NAMES_H_
 #define COMPONENTS_POLICY_CORE_COMMON_POLICY_PREF_NAMES_H_
 
 #include "components/policy/policy_export.h"
 
 namespace policy {
-namespace prefs {
+namespace policy_prefs {
 
 // Constants for the names of policy-related preferences.
-// TODO(dconnelly): remove POLICY_EXPORT once the statistics collector moves
-// to the policy component (crbug.com/271392).
+// TODO(dconnelly): remove POLICY_EXPORT once the policy code moves to the
+// policy component (crbug.com/271392).
+
 POLICY_EXPORT extern const char kLastPolicyStatisticsUpdate[];
+POLICY_EXPORT extern const char kUserPolicyRefreshRate[];
 
-}  // prefs
+}  // namespace policy_prefs
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_PREF_NAMES_H_