Settings People Revamp: Switch Change Picture to use iron-selector.

chrome/browser/resources/settings/people_page/change_picture.css

 /* Copyright (c) 2015 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. */
 
 #available-icons {
   -webkit-margin-start: 16px;
   margin-top: 16px;
 }
 
-#available-icons paper-button {
-  padding: 4px;
+#available-icons img {
+  border: 1px solid rgba(0, 0, 0, 0.15);
+  border-radius: 4px;
+  height: 64px;
+  padding: 3px;
+  width: 64px;
+}
+
+#available-icons img.iron-selected {
+  border: 2px solid rgb(0, 102, 204);
+  padding: 2px;
 }
 
 #preview-pane {
   flex-shrink: 0;
   margin: 18px 10px 0 0;
   width: 228px;
 }
 
 #preview-pane img {
   border: solid 1px #cacaca;
   border-radius: 4px;
   max-height: 220px;
   max-width: 220px;
   padding: 3px;
 }
-
-.user-image {
-  height: 64px;
-  width: 64px;
-}