Submit button incompatiable with desktop chrome.

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 b5247b60a07b91fcd892aaf50991b5f9001841c9..7980bdc2b5e6d2d8e1d325d9d9878052535e8132 100644
--- a/ui/login/account_picker/user_pod_row.js
+++ b/ui/login/account_picker/user_pod_row.js
@@ -757,8 +757,10 @@ cr.define('login', function() {
           this.handlePasswordKeyPress_.bind(this));
       this.passwordElement.addEventListener('input',
           this.handleInputChanged_.bind(this));
-      this.submitButton.addEventListener('click',
-          this.handleSubmitButtonClick_.bind(this));
+      if (this.submitButton) {
+        this.submitButton.addEventListener('click',
+            this.handleSubmitButtonClick_.bind(this));
+      }
 
       this.imageElement.addEventListener('load',
           this.parentNode.handlePodImageLoad.bind(this.parentNode, this));
@@ -1132,7 +1134,8 @@ cr.define('login', function() {
     },
 
     set showError(visible) {
-      this.submitButton.classList.toggle('error-shown', visible);
+      if (this.submitButton)
+        this.submitButton.classList.toggle('error-shown', visible);
     },
 
     toggleTransitions: function(enable) {
@@ -1862,7 +1865,8 @@ cr.define('login', function() {
     handleInputChanged_: function(e) {
       if (this.pinKeyboard)
         this.pinKeyboard.value = this.passwordElement.value;
-      this.submitButton.disabled = this.passwordElement.value.length <= 0;
+      if (this.submitButton)
+        this.submitButton.disabled = this.passwordElement.value.length <= 0;
       this.showError = false;
     },