Add cr_policy_indicator for settings controls

ui/webui/resources/cr_elements/v1_0/policy/cr_policy_indicator.css

Index: ui/webui/resources/cr_elements/v1_0/policy/cr_policy_indicator.css
diff --git a/chrome/browser/resources/settings/checkbox/checkbox.css b/ui/webui/resources/cr_elements/v1_0/policy/cr_policy_indicator.css
similarity index 52%
copy from chrome/browser/resources/settings/checkbox/checkbox.css
copy to ui/webui/resources/cr_elements/v1_0/policy/cr_policy_indicator.css
index ad35bc55961db1a8f952c62364dc09bd42b8328a..518050d28fe4d6c7b7e91c335098b31270ee2e34 100644
--- a/chrome/browser/resources/settings/checkbox/checkbox.css
+++ b/ui/webui/resources/cr_elements/v1_0/policy/cr_policy_indicator.css
@@ -2,20 +2,15 @@
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file. */
 
+/* Note: we use display: block here to avoid positioning issues related to
+ *  the use of overflow: hidden. */
 :host {
   display: block;
-  margin-bottom: 10px;
-  margin-top: 10px;
+  height: 20px;
+  width: 20px;
 }
 
-#checkbox {
-  -webkit-margin-end: 10px;
-}
-
-.main-label {
-  -webkit-margin-end: 10px;
-}
-
-.sub-label {
-  color: rgba(0, 0, 0, .5);
+img {
+  height: 100%;
+  width: 100%;
 }