manager: Move GcalClock to GcalApplication

GcalManager is basically an object that is shared
among classes that need to modify calendars, while
GcalClock is just a wall clock implementation.

Move it to GcalApplication, so that objects without
access to GcalManager can still access the clock.

src/gcal-manager.c

@@ -90,8 +90,6 @@ struct _GcalManager
 
   GoaClient          *goa_client;
 
-  GcalClock          *clock;
-
   /* state flags */
   gboolean            goa_client_ready;
   gint                sources_at_launch;
@@ -108,7 +106,6 @@ G_DEFINE_TYPE (GcalManager, gcal_manager, G_TYPE_OBJECT)
 enum
 {
   PROP_0,
-  PROP_CLOCK,
   PROP_DEFAULT_CALENDAR,
   PROP_LOADING,
   PROP_SETTINGS,
@@ -776,7 +773,6 @@ gcal_manager_finalize (GObject *object)
 
   GCAL_ENTRY;
 
-  g_clear_object (&self->clock);
   g_clear_object (&self->settings);
   g_clear_object (&self->goa_client);
   g_clear_object (&self->e_data_model);
@@ -871,17 +867,6 @@ gcal_manager_class_init (GcalManagerClass *klass)
   object_class->set_property = gcal_manager_set_property;
   object_class->get_property = gcal_manager_get_property;
 
-  /**
-   * GcalManager:clock:
-   *
-   * The internal clock of Calendar.
-   */
-  properties[PROP_CLOCK] = g_param_spec_object ("clock",
-                                                "Clock",
-                                                "The internal clock of Calendar",
-                                                GCAL_TYPE_CLOCK,
-                                                G_PARAM_READWRITE);
-
   /**
    * GcalManager:default-calendar:
    *
@@ -964,7 +949,6 @@ gcal_manager_class_init (GcalManagerClass *klass)
 static void
 gcal_manager_init (GcalManager *self)
 {
-  self->clock = gcal_clock_new ();
   self->settings = g_settings_new ("org.gnome.calendar");
   self->system_timezone = e_cal_util_get_system_timezone ();
 }
@@ -1856,22 +1840,6 @@ gcal_manager_get_loading (GcalManager *self)
   return !self->goa_client_ready || self->sources_at_launch > 0;
 }
 
-/**
- * gcal_manager_get_clock:
- * @self: a #GcalManager
- *
- * Retrieves the internal #GcalClock of @self.
- *
- * Returns: (transfer none): a #GcalClock.
- */
-GcalClock*
-gcal_manager_get_clock (GcalManager *self)
-{
-  g_return_val_if_fail (GCAL_IS_MANAGER (self), NULL);
-
-  return self->clock;
-}
-
 /**
  * gcal_manager_get_event_from_shell_search:
  * @self: a #GcalManager