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/ui/messageTray.js

@@ -83,11 +83,9 @@ function _fixMarkup(text, allowMarkup) {
     return GLib.markup_escape_text(text, -1);
 }
 
-function URLHighlighter(text, lineWrap, allowMarkup) {
-    this._init(text, lineWrap, allowMarkup);
-}
+const URLHighlighter = new Lang.Class({
+    Name: 'URLHighlighter',
 
-URLHighlighter.prototype = {
     _init: function(text, lineWrap, allowMarkup) {
         if (!text)
             text = '';
@@ -211,13 +209,11 @@ URLHighlighter.prototype = {
         }
         return -1;
     }
-};
+});
 
-function FocusGrabber() {
-    this._init();
-}
+const FocusGrabber = new Lang.Class({
+    Name: 'FocusGrabber',
 
-FocusGrabber.prototype = {
     _init: function() {
         this.actor = null;
 
@@ -351,7 +347,7 @@ FocusGrabber.prototype = {
             this._togglingFocusGrabMode = false;
         }
     }
-}
+});
 Signals.addSignalMethods(FocusGrabber.prototype);
 
 // Notification:
@@ -1141,11 +1137,9 @@ const Source = new Lang.Class({
 });
 Signals.addSignalMethods(Source.prototype);
 
-function SummaryItem(source) {
-    this._init(source);
-}
+const SummaryItem = new Lang.Class({
+    Name: 'SummaryItem',
 
-SummaryItem.prototype = {
     _init: function(source) {
         this.source = source;
         this.source.connect('notification-added', Lang.bind(this, this._notificationAddedToSource));
@@ -1336,14 +1330,12 @@ SummaryItem.prototype = {
         if (this.notificationStack.get_children().length > 0)
             this.notificationStack.get_children()[0]._delegate.setIconVisible(true);
     }
-};
+});
 Signals.addSignalMethods(SummaryItem.prototype);
 
-function MessageTray() {
-    this._init();
-}
+const MessageTray = new Lang.Class({
+    Name: 'MessageTray',
 
-MessageTray.prototype = {
     _init: function() {
         this._presence = new GnomeSession.Presence(Lang.bind(this, function(proxy, error) {
             this._onStatusChanged(proxy.status);
@@ -2422,7 +2414,7 @@ MessageTray.prototype = {
         if (this._clickedSummaryItem)
             this._updateState();
     }
-};
+});
 
 const SystemNotificationSource = new Lang.Class({
     Name: 'SystemNotificationSource',