Getting rid of unused DialogManager calls.

MyTracks/src/com/google/android/apps/mytracks/MyTracks.java

@@ -63,11 +63,6 @@ import android.widget.Toast;
 public class MyTracks extends TabActivity implements OnTouchListener {
   private TrackDataHub dataHub;
 
-  /*
-   * Dialogs manager.
-   */
-  private DialogManager dialogManager;
-
   /*
    * Menu manager.
    */
@@ -135,7 +130,6 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     preferences = getSharedPreferences(Constants.SETTINGS_NAME, 0);
     dataHub = new TrackDataHub(this, preferences, providerUtils);
     menuManager = new MenuManager(this);
-    dialogManager = new DialogManager(this);
     serviceBinder = TrackRecordingServiceBinder.getInstance(this);
 
     // The volume we want to control is the Text-To-Speech volume