Remove dead code

Author: dbrattli

rx/concurrency/scheduleperiodic.py

@@ -7,7 +7,6 @@
 
 from .schedulerbase import SchedulerBase
 from .scheduleditem import ScheduledItem
-from .scheduleperiodic import SchedulePeriodic
 
 log = logging.getLogger("Rx")
 
@@ -69,11 +68,6 @@ def schedule_absolute(self, duetime: typing.AbsoluteTime, action: typing.Schedul
         self.queue.enqueue(si)
         return si.disposable
 
-    def schedule_periodic(self, period: typing.RelativeTime, action: typing.ScheduledPeriodicAction,
-                          state: typing.TState = None):
-        scheduler = SchedulePeriodic(self, period, action, state)
-        return scheduler.start()
-
     def start(self) -> None:
         """Starts the virtual time scheduler."""