Remove added unused methods

synapse/metrics/metric.py

@@ -151,12 +151,5 @@ class CacheMetric(object):
     def inc_misses(self, *values):
         self.total.inc(*values)
 
-    def inc_hits_by(self, inc, *values):
-        self.hits.inc_by(inc, *values)
-        self.total.inc_by(inc, *values)
-
-    def inc_misses_by(self, inc, *values):
-        self.total.inc_by(inc, *values)
-
     def render(self):
         return self.hits.render() + self.total.render() + self.size.render()