Permission TestRunner: only use permissions-helper.js from http/tests/.

LayoutTests/resources/permissions-helper.js

-// This file provides a PermissionsHelper object which can be used by
-// LayoutTests using testRunner to handle permissions. The methods in the object
-// return promises so can be used to write idiomatic, race-free code.
-//
-// The current available methods are:
-// - setPermission: given a permission name (known by testRunner) and a state,
-// it will set the permission to the specified state and resolve the promise
-// when done.
-// Example:
-// PermissionsHelper.setPermission('geolocation', 'prompt').then(runTest);
-"use strict";
-
-var PermissionsHelper = (function() {
-  function nameToObject(permissionName) {
-    switch (permissionName) {
-      case "midi":
-        return {name: "midi"};
-      case "midi-sysex":
-        return {name: "midi", sysex: true};
-      case "push-messaging":
-        return {name: "push", userVisibleOnly: true};
-      case "notifications":
-        return {name: "notifications"};
-      case "geolocation":
-        return {name: "geolocation"};
-      default:
-        throw "Invalid permission name provided";
-    }
-  }
-
-  return {
-    setPermission: function(name, state) {
-      return new Promise(function(resolver, reject) {
-        navigator.permissions.query(nameToObject(name)).then(function(result) {
-            if (result.state == state) {
-                resolver()
-                return;
-            }
-
-            result.onchange = function() {
-                result.onchange = null;
-                resolver();
-            };
-
-            testRunner.setPermission(name, state, location.origin, location.origin);
-        });
-      });
-    }
-  }
-})();