Remove not really needed method

Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/translation.py

@@ -991,7 +991,7 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
         for check in CHECKS:
             if not CHECKS[check].source:
                 continue
-            cnt = self.get_failing_checks(check)
+            cnt = self.unit_set.count_type(check, self)
             if cnt > 0:
                 result.append((
                     check,
@@ -1260,14 +1260,6 @@ class Translation(models.Model, URLMixin, PercentMixin, LoggerMixin):
 
         return ret, store.count_units()
 
-    def get_failing_checks(self, check):
-        '''
-        Returns number of units with failing checks.
-
-        By default for all checks or check type can be specified.
-        '''
-        return self.unit_set.count_type(check, self)
-
     def invalidate_cache(self, cache_type=None):
         '''
         Invalidates any cached stats.