make containsPoint async everywhere

ext/fg/js/frontend.js

@@ -294,7 +294,7 @@ class Frontend {
     async searchAt(point, type) {
         if (
             this.pendingLookup ||
-            (this.popup.containsPointIsAsync() ? await this.popup.containsPointAsync(point) : this.popup.containsPoint(point))
+            await this.popup.containsPoint(point)
         ) {
             return;
         }

ext/fg/js/popup-proxy-host.js

@@ -110,7 +110,7 @@ class PopupProxyHost {
 
     async containsPoint(id, point) {
         const popup = this.getPopup(id);
-        return popup.containsPointIsAsync() ? await popup.containsPointAsync(point) : popup.containsPoint(point);
+        return await popup.containsPoint(point);
     }
 
     async termsShow(id, elementRect, definitions, options, context) {

ext/fg/js/popup-proxy.js

@@ -69,21 +69,13 @@ class PopupProxy {
         return await this.invokeHostApi('setVisible', {id, visible});
     }
 
-    containsPoint() {
-        throw 'Non-async function not supported';
-    }
-
-    async containsPointAsync(point) {
+    async containsPoint(point) {
         if (this.id === null) {
             return false;
         }
         return await this.invokeHostApi('containsPoint', {id: this.id, point});
     }
 
-    containsPointIsAsync() {
-        return true;
-    }
-
     async termsShow(elementRect, definitions, options, context) {
         const id = await this.getPopupId();
         elementRect = PopupProxy.DOMRectToJson(elementRect);

ext/fg/js/popup.js

@@ -248,7 +248,7 @@ class Popup {
         }
     }
 
-    containsPoint(point) {
+    async containsPoint(point) {
         if (!this.isVisible()) {
             return false;
         }