Move common cr-policy-indicator behavior into CrPolicyIndicatorBehavior

chrome/test/data/webui/cr_elements/cr_policy_strings.js

+// Copyright 2017 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.
+
+/** @fileoverview Sets up strings used by policy indicator elements. */
+var CrPolicyStrings = CrPolicyStrings || {
+  controlledSettingPolicy: 'policy',
+  controlledSettingRecommendedMatches: 'matches',
+  controlledSettingRecommendedDiffers: 'differs',
+  controlledSettingShared: 'shared: $1',
+  controlledSettingOwner: 'owner: $1',
+};