Replace this.async() with setTimeout()

async() is Polymer 1 legacy.

Change-Id: Iab589654ba4143aafafbd56a04e316716e402662
diff --git a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
index 1b85e21..34572c5 100644
--- a/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
+++ b/polygerrit-ui/app/elements/change-list/gr-change-list-view/gr-change-list-view.ts
@@ -141,7 +141,7 @@
 
     // NOTE: This method may be called before attachment. Fire title-change
     // in an async so that attachment to the DOM can take place first.
-    this.async(() => fireTitleChange(this, this._query));
+    setTimeout(() => fireTitleChange(this, this._query));
 
     this.restApiService
       .getPreferences()