Bug 1629044 [wpt PR 22853] - Update interfaces/appmanifest.idl and test, a=testonly

Automatic update from web-platform-tests
Update interfaces/appmanifest.idl and test (#22853)

The associated IDL test, appmanifest/idlharness.window.js, is removed
entirely as the IDL file is now only dictionaries and enums (which
cannot be validated by idlharness).

Closes https://github.com/web-platform-tests/wpt/pull/22617
--

wpt-commits: 194df1e4cab3851d3c5d08157e65d3ea4ea49416
wpt-pr: 22853

testing/web-platform/tests/appmanifest/idlharness.window.js

@@ -1,17 +0,0 @@
-// META: script=/resources/WebIDLParser.js
-// META: script=/resources/idlharness.js
-
-// https://w3c.github.io/manifest/
-
-'use strict';
-
-idl_test(
-  ['appmanifest'],
-  ['html', 'dom'],
-  idl_array => {
-    idl_array.add_objects({
-      Window: ['window'],
-      BeforeInstallPromptEvent: ['new BeforeInstallPromptEvent("type")'],
-    });
-  }
-);

testing/web-platform/tests/interfaces/appmanifest.idl

@@ -3,26 +3,6 @@
 // (https://github.com/tidoust/reffy-reports)
 // Source: Web App Manifest (https://w3c.github.io/manifest/)
 
-[Exposed=Window]
-interface BeforeInstallPromptEvent : Event {
-  constructor(DOMString type, optional EventInit eventInitDict = {});
-  Promise<PromptResponseObject> prompt();
-};
-
-dictionary PromptResponseObject {
-  AppBannerPromptOutcome userChoice;
-};
-
-enum AppBannerPromptOutcome {
-  "accepted",
-  "dismissed"
-};
-
-partial interface Window {
-  attribute EventHandler onappinstalled;
-  attribute EventHandler onbeforeinstallprompt;
-};
-
 dictionary WebAppManifest {
    TextDirectionType dir = "auto";
    DOMString lang;