Use svg icon to avoid lazy loading of Polymer elements for user pods

chrome/browser/resources/md_user_manager/user_manager_styles.html

Index: chrome/browser/resources/md_user_manager/user_manager_styles.html
diff --git a/chrome/browser/resources/md_user_manager/user_manager_styles.html b/chrome/browser/resources/md_user_manager/user_manager_styles.html
index 2699be7e96f4487f0fa80c638bf965458ae25a9b..36b1e6d700e65fcda548b07a59d638875c7572b1 100644
--- a/chrome/browser/resources/md_user_manager/user_manager_styles.html
+++ b/chrome/browser/resources/md_user_manager/user_manager_styles.html
@@ -192,8 +192,9 @@
       }
 
       .reauth-hint-container .reauth-warning {
-        --iron-icon-height: 20px;
-        --iron-icon-width: 20px;
+        -webkit-mask-size: 16px;
+        height: 20px;
+        width: 20px;
       }
 
       .action-box-area.active .action-box-button {