Bug 1619630 - remove useless 'dispatcher' argument to various JSWindowActorChild constructors, r=NeilDeakin

Differential Revision: https://phabricator.services.mozilla.com/D65126

--HG--
extra : moz-landing-system : lando

toolkit/actors/DateTimePickerChild.jsm

@@ -20,8 +20,8 @@ class DateTimePickerChild extends JSWindowActorChild {
    * On init, just listen for the event to open the picker, once the picker is
    * opened, we'll listen for update and close events.
    */
-  constructor(dispatcher) {
-    super(dispatcher);
+  constructor() {
+    super();
 
     this._inputElement = null;
   }

toolkit/actors/PictureInPictureChild.jsm

@@ -63,8 +63,8 @@ XPCOMUtils.defineLazyGetter(this, "gToggleOverrides", () => {
  * hovering.
  */
 class PictureInPictureToggleChild extends JSWindowActorChild {
-  constructor(dispatcher) {
-    super(dispatcher);
+  constructor() {
+    super();
     // We need to maintain some state about various things related to the
     // Picture-in-Picture toggles - however, for now, the same
     // PictureInPictureToggleChild might be re-used for different documents.

toolkit/actors/UAWidgetsChild.jsm

@@ -9,8 +9,8 @@ var EXPORTED_SYMBOLS = ["UAWidgetsChild"];
 const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 
 class UAWidgetsChild extends JSWindowActorChild {
-  constructor(dispatcher) {
-    super(dispatcher);
+  constructor() {
+    super();
 
     this.widgets = new WeakMap();
     this.prefsCache = new Map();