Noop scrollFocusedPodIntoView on Windows, Linux and Mac

ui/login/account_picker/user_pod_row.js

Index: ui/login/account_picker/user_pod_row.js
diff --git a/ui/login/account_picker/user_pod_row.js b/ui/login/account_picker/user_pod_row.js
index 3dc15f0745dfb11ba4eb2ac4694556ac29da0c3c..60954dec36d2124f019aa044c1a9a290ce8e1091 100644
--- a/ui/login/account_picker/user_pod_row.js
+++ b/ui/login/account_picker/user_pod_row.js
@@ -2321,6 +2321,10 @@ cr.define('login', function() {
 
       // First check whether focused pod is already fully visible.
       var visibleArea = $('scroll-container');
+      // Visible area may not defined at user manager screen on all platforms.
+      // Windows, Mac and Linux do not have visible area.
+      if (!visibleArea)
+        return;
       var scrollTop = visibleArea.scrollTop;
       var clientHeight = visibleArea.clientHeight;
       var podTop = $('oobe').offsetTop + pod.offsetTop;