cleanup: Port non-GObject classes to JS6 classes

ES6 finally adds standard class syntax to the language, so we can
replace our custom Lang.Class framework with the new syntax. Any
classes that inherit from GObject will need special treatment,
so limit the port to regular javascript classes for now.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/361

js/ui/remoteMenu.js

@@ -4,7 +4,6 @@ const Atk = imports.gi.Atk;
 const GLib = imports.gi.GLib;
 const GObject = imports.gi.GObject;
 const Gio = imports.gi.Gio;
-const Lang = imports.lang;
 const Shell = imports.gi.Shell;
 const ShellMenu = imports.gi.ShellMenu;
 const St = imports.gi.St;
@@ -38,10 +37,8 @@ function _removeItem(menu, position) {
     items[position].destroy();
 }
 
-var RemoteMenuSeparatorItemMapper = new Lang.Class({
-    Name: 'RemoteMenuSeparatorItemMapper',
-
-    _init(trackerItem) {
+var RemoteMenuSeparatorItemMapper = class {
+    constructor(trackerItem) {
         this._trackerItem = trackerItem;
         this.menuItem = new PopupMenu.PopupSeparatorMenuItem();
         this._trackerItem.connect('notify::label', this._updateLabel.bind(this));
@@ -50,36 +47,31 @@ var RemoteMenuSeparatorItemMapper = new Lang.Class({
         this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
-    },
+    }
 
     _updateLabel() {
         this.menuItem.label.text = stripMnemonics(this._trackerItem.label);
-    },
-});
+    }
+};
 
-var RequestSubMenu = new Lang.Class({
-    Name: 'RequestSubMenu',
-    Extends: PopupMenu.PopupSubMenuMenuItem,
-
-    _init() {
-        this.parent('');
+var RequestSubMenu = class extends PopupMenu.PopupSubMenuMenuItem {
+    constructor() {
+        super('');
         this._requestOpen = false;
-    },
+    }
 
     _setOpenState(open) {
         this.emit('request-open', open);
         this._requestOpen = open;
-    },
+    }
 
     _getOpenState() {
         return this._requestOpen;
-    },
-});
+    }
+};
 
-var RemoteMenuSubmenuItemMapper = new Lang.Class({
-    Name: 'RemoteMenuSubmenuItemMapper',
-
-    _init(trackerItem) {
+var RemoteMenuSubmenuItemMapper = class {
+    constructor(trackerItem) {
         this._trackerItem = trackerItem;
         this.menuItem = new RequestSubMenu();
         this._trackerItem.connect('notify::label', this._updateLabel.bind(this));
@@ -100,22 +92,19 @@ var RemoteMenuSubmenuItemMapper = new Lang.Class({
         this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
-    },
+    }
 
     destroy() {
         this._tracker.destroy();
-        this.parent();
-    },
+    }
 
     _updateLabel() {
         this.menuItem.label.text = stripMnemonics(this._trackerItem.label);
-    },
-});
+    }
+};
 
-var RemoteMenuItemMapper = new Lang.Class({
-    Name: 'RemoteMenuItemMapper',
-
-    _init(trackerItem) {
+var RemoteMenuItemMapper = class {
+    constructor(trackerItem) {
         this._trackerItem = trackerItem;
 
         this.menuItem = new PopupMenu.PopupBaseMenuItem();
@@ -146,20 +135,20 @@ var RemoteMenuItemMapper = new Lang.Class({
         this.menuItem.connect('destroy', () => {
             trackerItem.run_dispose();
         });
-    },
+    }
 
     _updateIcon() {
         this._icon.gicon = this._trackerItem.icon;
         this._icon.visible = (this._icon.gicon != null);
-    },
+    }
 
     _updateLabel() {
         this._label.text = stripMnemonics(this._trackerItem.label);
-    },
+    }
 
     _updateSensitivity() {
         this.menuItem.setSensitive(this._trackerItem.sensitive);
-    },
+    }
 
     _updateDecoration() {
         let ornamentForRole = {};
@@ -171,7 +160,7 @@ var RemoteMenuItemMapper = new Lang.Class({
             ornament = ornamentForRole[this._trackerItem.role];
 
         this.menuItem.setOrnament(ornament);
-    },
+    }
 
     _updateRole() {
         let a11yRoles = {};
@@ -183,15 +172,12 @@ var RemoteMenuItemMapper = new Lang.Class({
         this.menuItem.actor.accessible_role = a11yRole;
 
         this._updateDecoration();
-    },
-});
+    }
+};
 
-var RemoteMenu = new Lang.Class({
-    Name: 'RemoteMenu',
-    Extends: PopupMenu.PopupMenu,
-
-    _init(sourceActor, model, actionGroup) {
-        this.parent(sourceActor, 0.0, St.Side.TOP);
+var RemoteMenu = class extends PopupMenu.PopupMenu {
+    constructor(sourceActor, model, actionGroup) {
+        super(sourceActor, 0.0, St.Side.TOP);
 
         this._model = model;
         this._actionGroup = actionGroup;
@@ -200,14 +186,14 @@ var RemoteMenu = new Lang.Class({
                                               null, /* action namespace */
                                               _insertItem.bind(null, this),
                                               _removeItem.bind(null, this));
-    },
+    }
 
     get actionGroup() {
         return this._actionGroup;
-    },
+    }
 
     destroy() {
         this._tracker.destroy();
-        this.parent();
-    },
-});
+        super.destroy();
+    }
+};