Port all classes with inheritance to class framework

All classes that have at least one other derived class (and thus
benefit from the framework) have been now ported. These includes
NMDevice, SearchProvider, AltTab.SwitcherList, and some other
stuff around.

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

js/ui/dash.js

@@ -19,11 +19,9 @@ const DASH_ANIMATION_TIME = 0.2;
 
 // A container like StBin, but taking the child's scale into account
 // when requesting a size
-function DashItemContainer() {
-    this._init();
-}
+const DashItemContainer = new Lang.Class({
+    Name: 'DashItemContainer',
 
-DashItemContainer.prototype = {
     _init: function() {
         this.actor = new Shell.GenericContainer({ style_class: 'dash-item-container' });
         this.actor.connect('get-preferred-width',
@@ -157,17 +155,14 @@ DashItemContainer.prototype = {
     get childOpacity() {
         return this._childOpacity;
     }
-};
+});
 
-function RemoveFavoriteIcon() {
-    this._init();
-}
-
-RemoveFavoriteIcon.prototype = {
-    __proto__: DashItemContainer.prototype,
+const RemoveFavoriteIcon = new Lang.Class({
+    Name: 'RemoveFavoriteIcon',
+    Extends: DashItemContainer,
 
     _init: function() {
-        DashItemContainer.prototype._init.call(this);
+        this.parent();
 
         this._iconBin = new St.Bin({ style_class: 'remove-favorite' });
         this._iconActor = null;
@@ -219,22 +214,17 @@ RemoveFavoriteIcon.prototype = {
 
         return true;
     }
-};
+});
 
-
-function DragPlaceholderItem() {
-    this._init();
-}
-
-DragPlaceholderItem.prototype = {
-    __proto__: DashItemContainer.prototype,
+const DragPlaceholderItem = new Lang.Class({
+    Name: 'DragPlaceholderItem',
+    Extends: DashItemContainer,
 
     _init: function() {
-        DashItemContainer.prototype._init.call(this);
+        this.parent();
         this.setChild(new St.Bin({ style_class: 'placeholder' }));
     }
-};
-
+});
 
 function Dash() {
     this._init();