Remove GestureEventListeners

LegacyElement extends it anyway, so there is absolutely no point in
using it directly.

Change-Id: Ic91e884198d237682338db47c5037d1f844372af
diff --git a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
index bf532ef..f364c01 100644
--- a/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
+++ b/polygerrit-ui/app/elements/shared/gr-list-view/gr-list-view.ts
@@ -18,7 +18,6 @@
 import '@polymer/iron-icon/iron-icon';
 import '../../../styles/shared-styles';
 import '../gr-button/gr-button';
-import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners';
 import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin';
 import {PolymerElement} from '@polymer/polymer/polymer-element';
 import {htmlTemplate} from './gr-list-view_html';
@@ -38,9 +37,7 @@
 const DEBOUNCER_RELOAD = 'reload';
 
 @customElement('gr-list-view')
-class GrListView extends GestureEventListeners(
-  LegacyElementMixin(PolymerElement)
-) {
+class GrListView extends LegacyElementMixin(PolymerElement) {
   static get template() {
     return htmlTemplate;
   }