libevent: remove timer_finished and timer_canceled functions

eventlet/hubs/libevent.py

@@ -92,7 +92,7 @@ class Hub(object):
         except ValueError:
             pass
         return self.greenlet.switch()
- 
+
     def run(self):
         while True:
             try:
@@ -169,9 +169,6 @@ class Hub(object):
             except:
                 traceback.print_exc()
 
-    def timer_finished(self, t): pass
-    def timer_canceled(self, t): pass
-
     def get_readers(self):
         return self.readers