WebUI: For cr-dialog, handle Enter keys in paper-inputs.

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 0e197fa099552776aee1e43f7e083202f6fc77ca..4c49a3a9121eec83c30f99a13af9e20d5822d294 100644
--- a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
+++ b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
@@ -113,11 +113,13 @@ Polymer({
    * @private
    */
   onKeypress_: function(e) {
-    if (e.target != this)
-      return;
     if (e.key != 'Enter')
       return;
 
+    // Accept Enter keys from either the dialog, or a child paper-input element.
+    if (e.target != this && e.target.tagName != 'PAPER-INPUT')
+      return;
+
     var actionButton =
         this.querySelector('.action-button:not([disabled]):not([hidden])');
     if (actionButton) {