WebUI: For cr-dialog, make Enter key ignore disabled or hidden buttons

ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js

Index: ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
diff --git a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
index d598988232d717b2ce4eae42d65783c6a61e4ceb..0e197fa099552776aee1e43f7e083202f6fc77ca 100644
--- a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
+++ b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
@@ -118,8 +118,9 @@ Polymer({
     if (e.key != 'Enter')
       return;
 
-    var actionButton = this.querySelector('.action-button');
-    if (actionButton && !actionButton.disabled) {
+    var actionButton =
+        this.querySelector('.action-button:not([disabled]):not([hidden])');
+    if (actionButton) {
       actionButton.click();
       e.preventDefault();
     }