Port everything to class framework

The last patch in the sequence. Every place that was previously
setting prototype has been ported to Lang.Class, to make code more
concise and allow for better toString().

https://bugzilla.gnome.org/show_bug.cgi?id=664436

js/gdm/loginDialog.js

@@ -140,11 +140,9 @@ function _smoothlyResizeActor(actor, width, height) {
     return hold;
 }
 
-function UserListItem(user, reason) {
-    this._init(user, reason);
-}
+const UserListItem = new Lang.Class({
+    Name: 'UserListItem',
 
-UserListItem.prototype = {
     _init: function(user) {
         this.user = user;
         this._userChangedId = this.user.connect('changed',
@@ -273,15 +271,12 @@ UserListItem.prototype = {
                          });
         return hold;
     }
-
-};
+});
 Signals.addSignalMethods(UserListItem.prototype);
 
-function UserList() {
-    this._init.apply(this, arguments);
-}
+const UserList = new Lang.Class({
+    Name: 'UserList',
 
-UserList.prototype = {
     _init: function() {
         this.actor = new St.ScrollView({ style_class: 'login-dialog-user-list-view'});
         this.actor.set_policy(Gtk.PolicyType.NEVER,
@@ -537,14 +532,12 @@ UserList.prototype = {
         item.actor.destroy();
         delete this._items[userName];
     }
-};
+});
 Signals.addSignalMethods(UserList.prototype);
 
-function SessionListItem(id, name) {
-    this._init(id, name);
-}
+const SessionListItem = new Lang.Class({
+    Name: 'SessionListItem',
 
-SessionListItem.prototype = {
     _init: function(id, name) {
         this.id = id;
 
@@ -599,14 +592,12 @@ SessionListItem.prototype = {
     _onClicked: function() {
         this.emit('activate');
     }
-};
+});
 Signals.addSignalMethods(SessionListItem.prototype);
 
-function SessionList() {
-    this._init();
-}
+const SessionList = new Lang.Class({
+    Name: 'SessionList',
 
-SessionList.prototype = {
     _init: function() {
         this.actor = new St.Bin();
 
@@ -737,18 +728,9 @@ SessionList.prototype = {
                          }));
         }
     }
-};
+});
 Signals.addSignalMethods(SessionList.prototype);
 
-function LoginDialog() {
-    if (_loginDialog == null) {
-        this._init();
-        _loginDialog = this;
-    }
-
-    return _loginDialog;
-}
-
 const LoginDialog = new Lang.Class({
     Name: 'LoginDialog',
     Extends: ModalDialog.ModalDialog,