Fix improper event reference for Safari

The keyboard shortcut behavior's shouldSuppressKeyboardShortcut method
mistakenly referred to the source event via `window.event`, but still
worked in browsers that provide `window.event` for legacy reasons.

Bug: Issue 6759
Change-Id: Iba97ffb3f9a073439af03e74466756138dcadeb2

polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html

diff --git a/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html b/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
index ca94495..8ce43b3 100644
--- a/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
+++ b/polygerrit-ui/app/behaviors/keyboard-shortcut-behavior/keyboard-shortcut-behavior.html
@@ -42,7 +42,7 @@
 
     shouldSuppressKeyboardShortcut(e) {
       e = getKeyboardEvent(e);
-      const tagName = Polymer.dom(event).rootTarget.tagName;
+      const tagName = Polymer.dom(e).rootTarget.tagName;
       if (tagName === 'INPUT' || tagName === 'TEXTAREA') {
         return true;
       }

polygerrit-ui/app/elements/admin/gr-project-detail-list/gr-project-detail-list.js

diff --git a/polygerrit-ui/app/elements/admin/gr-project-detail-list/gr-project-detail-list.js b/polygerrit-ui/app/elements/admin/gr-project-detail-list/gr-project-detail-list.js
index 859044f..edaf49a 100644
--- a/polygerrit-ui/app/elements/admin/gr-project-detail-list/gr-project-detail-list.js
+++ b/polygerrit-ui/app/elements/admin/gr-project-detail-list/gr-project-detail-list.js
@@ -166,8 +166,8 @@
       this._isEditing = false;
     },
 
-    _handleSaveRevision() {
-      this._setProjectHead(this._project, this._revisedRef, event);
+    _handleSaveRevision(e) {
+      this._setProjectHead(this._project, this._revisedRef, e);
     },
 
     _setProjectHead(project, ref, event) {