ES6ify /gr-confirm-dialog/*

Bug: Issue 6179
Change-Id: I71007decce1522cdf2574dff4db0762fb9bc6acd
diff --git a/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog.js b/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog.js
index dbddb04..3d5e781 100644
--- a/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog.js
+++ b/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog.js
@@ -44,12 +44,12 @@
       role: 'dialog',
     },
 
-    _handleConfirmTap: function(e) {
+    _handleConfirmTap(e) {
       e.preventDefault();
       this.fire('confirm', null, {bubbles: false});
     },
 
-    _handleCancelTap: function(e) {
+    _handleCancelTap(e) {
       e.preventDefault();
       this.fire('cancel', null, {bubbles: false});
     },
diff --git a/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog_test.html b/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog_test.html
index 3eec979..cb5d688 100644
--- a/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog_test.html
+++ b/polygerrit-ui/app/elements/shared/gr-confirm-dialog/gr-confirm-dialog_test.html
@@ -33,15 +33,15 @@
 </test-fixture>
 
 <script>
-  suite('gr-confirm-dialog tests', function() {
-    var element;
+  suite('gr-confirm-dialog tests', () => {
+    let element;
 
-    setup(function() {
+    setup(() => {
       element = fixture('basic');
     });
 
-    test('events', function(done) {
-      var numEvents = 0;
+    test('events', done => {
+      let numEvents = 0;
       function handler() { if (++numEvents == 2) { done(); } }
 
       element.addEventListener('confirm', handler);
@@ -50,6 +50,5 @@
       MockInteractions.tap(element.$$('gr-button[primary]'));
       MockInteractions.tap(element.$$('gr-button:not([primary])'));
     });
-
   });
 </script>