shell-provider: use GcalEvent instead of event data

Following the sequence of porting commits, make the Shell's
search provider class handle events using GcalEvent classes
instead of the old GcalEventData structure.

src/gcal-manager.h

@@ -21,6 +21,7 @@
 #define __GCAL_MANAGER_H__
 
 #include "e-cal-data-model.h"
+#include "gcal-event.h"
 
 #include <libical/icaltime.h>
 #include <goa/goa.h>
@@ -134,7 +135,7 @@ GList*         gcal_manager_get_events              (GcalManager        *manager
 
 gboolean       gcal_manager_load_completed          (GcalManager        *manager);
 
-GcalEventData* gcal_manager_get_event_from_shell_search (GcalManager        *manager,
+GcalEvent*     gcal_manager_get_event_from_shell_search (GcalManager        *manager,
                                                          const gchar        *uuid);
 
 gboolean       gcal_manager_is_goa_client_ready    (GcalManager        *manager);