manager: Remove gcal_manager_is_client_writable()

It is now handled by GcalCalendar, and nobody else uses
it.

src/core/gcal-manager.c

@@ -1158,31 +1158,6 @@ gcal_manager_refresh (GcalManager *self)
   GCAL_EXIT;
 }
 
-/**
- * gcal_manager_is_client_writable:
- * @self: a #GcalManager
- * @source: an #ESource
- *
- * Retrieves whether @source is writable.
- *
- * Returns: %TRUE if @source is writable, %FALSE otherwise.
- */
-gboolean
-gcal_manager_is_client_writable (GcalManager *self,
-                                 ESource     *source)
-{
-  GcalCalendar *calendar;
-
-  GCAL_ENTRY;
-
-  calendar = g_hash_table_lookup (self->clients, source);
-
-  if (!calendar)
-    GCAL_RETURN (FALSE);
-
-  GCAL_RETURN (!gcal_calendar_is_read_only (calendar));
-}
-
 /**
  * gcal_manager_create_event:
  * @self: a #GcalManager

src/core/gcal-manager.h

@@ -64,9 +64,6 @@ gchar*               gcal_manager_query_client_data              (GcalManager
 
 void                 gcal_manager_refresh                        (GcalManager        *self);
 
-gboolean             gcal_manager_is_client_writable             (GcalManager        *self,
-                                                                  ESource            *source);
-
 void                 gcal_manager_create_event                   (GcalManager        *self,
                                                                   GcalEvent          *event);