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

chrome/test/data/webui/md_user_manager/user_manager_browsertest.js

Index: chrome/test/data/webui/md_user_manager/user_manager_browsertest.js
diff --git a/chrome/test/data/webui/md_user_manager/user_manager_browsertest.js b/chrome/test/data/webui/md_user_manager/user_manager_browsertest.js
index 2aaa9e8b81586ac07404855ef278b46902c10e17..47e0368eeaa486bc5633fc0e74de6b8348facb02 100644
--- a/chrome/test/data/webui/md_user_manager/user_manager_browsertest.js
+++ b/chrome/test/data/webui/md_user_manager/user_manager_browsertest.js
@@ -37,8 +37,7 @@ UserManagerBrowserTest.prototype = {
   runAccessibilityChecks: false,
 };
 
-// Flaky timeout failures on all platforms; see https://crbug.com/613191.
-TEST_F('UserManagerBrowserTest', 'DISABLED_UserManagerTest', function() {
+TEST_F('UserManagerBrowserTest', 'UserManagerTest', function() {
   // Disable 'pod-row' so it won't handle click events after we clear the body.
   $('pod-row').disabled = true;