FocusManager: don't use singleton (#521)

wingpanel-interface/DBusServer.vala

@@ -20,6 +20,7 @@
 [DBus (name = "org.pantheon.gala.WingpanelInterface")]
 public class WingpanelInterface.DBusServer : Object {
     private BackgroundManager background_manager;
+    private FocusManager focus_manager;
 
     public signal void state_changed (BackgroundState state, uint animation_duration);
 
@@ -28,17 +29,19 @@ public class WingpanelInterface.DBusServer : Object {
         background_manager.state_changed.connect ((state, animation_duration) => {
             state_changed (state, animation_duration);
         });
+
+        focus_manager = new FocusManager ();
     }
 
     public bool begin_grab_focused_window (int x, int y, int button, uint time, uint state) throws GLib.Error {
-        return FocusManager.get_default ().begin_grab_focused_window (x, y, button, time, state);
+        return focus_manager.begin_grab_focused_window (x, y, button, time, state);
     }
 
     public void remember_focused_window () throws GLib.Error {
-        FocusManager.get_default ().remember_focused_window ();
+        focus_manager.remember_focused_window ();
     }
 
     public void restore_focused_window () throws GLib.Error {
-        FocusManager.get_default ().restore_focused_window ();
+        focus_manager.restore_focused_window ();
     }
 }

wingpanel-interface/FocusManager.vala

@@ -18,8 +18,6 @@
  */
 
 public class WingpanelInterface.FocusManager : Object {
-    private static FocusManager? instance = null;
-
     private unowned Meta.Workspace? current_workspace = null;
     private unowned Meta.Window? last_focused_window = null;
     private unowned Meta.Window? last_focused_dialog_window = null;
@@ -140,12 +138,4 @@ public class WingpanelInterface.FocusManager : Object {
 
         current_workspace = workspace;
     }
-
-    public static FocusManager get_default () {
-        if (instance == null) {
-            instance = new FocusManager ();
-        }
-
-        return instance;
-    }
 }