cleanup: Use Function.prototype.bind()

When not using arrow notation with anonymous functions, we use Lang.bind()
to bind `this` to named callbacks. However since ES5, this functionality
is already provided by Function.prototype.bind() - in fact, Lang.bind()
itself uses it when no extra arguments are specified. Just use the built-in
function directly where possible, and use arrow notation in the few places
where we pass additional arguments.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/23

js/misc/smartcardManager.js

@@ -32,7 +32,7 @@ var SmartcardManager = new Lang.Class({
                                                                 name: "org.gnome.SettingsDaemon.Smartcard",
                                                                 objectPath: '/org/gnome/SettingsDaemon/Smartcard',
                                                                 knownInterfaces: [ SmartcardTokenIface ],
-                                                                onLoaded: Lang.bind(this, this._onLoaded) });
+                                                                onLoaded: this._onLoaded.bind(this) });
         this._insertedTokens = {};
         this._loginToken = null;
     },