Import Polymer classes instead of global ones in CommentApiMock

Change-Id: I01d619c73a6a15e6e789f41df55d7dfd7b292d77

polygerrit-ui/app/elements/diff/gr-comment-api/gr-comment-api-mock_test.js

@@ -14,41 +14,42 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-(function() {
-  'use strict';
 
-  class CommentApiMock extends Polymer.GestureEventListeners(
-      Polymer.LegacyElementMixin(
-          Polymer.Element)) {
-    static get is() { return 'comment-api-mock'; }
+import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js';
+import {PolymerElement} from '@polymer/polymer/polymer-element.js';
+import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js';
 
-    static get properties() {
-      return {
-        _changeComments: Object,
-      };
-    }
+class CommentApiMock extends GestureEventListeners(
+    LegacyElementMixin(
+        PolymerElement)) {
+  static get is() { return 'comment-api-mock'; }
 
-    loadComments() {
-      return this._reloadComments();
-    }
-
-    /**
-     * For the purposes of the mock, _reloadDrafts is not included because its
-     * response is the same type as reloadComments, just makes less API
-     * requests. Since this is for test purposes/mocked data anyway, keep this
-     * file simpler by just using _reloadComments here instead.
-     */
-    _reloadDraftsWithCallback(e) {
-      return this._reloadComments().then(() => e.detail.resolve());
-    }
-
-    _reloadComments() {
-      return this.$.commentAPI.loadAll(this._changeNum)
-          .then(comments => {
-            this._changeComments = this.$.commentAPI._changeComments;
-          });
-    }
+  static get properties() {
+    return {
+      _changeComments: Object,
+    };
   }
 
-  customElements.define(CommentApiMock.is, CommentApiMock);
-})();
+  loadComments() {
+    return this._reloadComments();
+  }
+
+  /**
+   * For the purposes of the mock, _reloadDrafts is not included because its
+   * response is the same type as reloadComments, just makes less API
+   * requests. Since this is for test purposes/mocked data anyway, keep this
+   * file simpler by just using _reloadComments here instead.
+   */
+  _reloadDraftsWithCallback(e) {
+    return this._reloadComments().then(() => e.detail.resolve());
+  }
+
+  _reloadComments() {
+    return this.$.commentAPI.loadAll(this._changeNum)
+        .then(comments => {
+          this._changeComments = this.$.commentAPI._changeComments;
+        });
+  }
+}
+
+customElements.define(CommentApiMock.is, CommentApiMock);