message: Remove `_enable_legacy_iterators` flag in TPUStrategy.
diff: @@ -140,10 +140,6 @@ class TPUStrategy(distribute_lib.Strategy):
  distribute_lib.distribution_strategy_replica_gauge.get_cell(
  "num_replicas_per_worker").set(self.extended.num_replicas_per_host)
  - # TODO(b/155193424): Enable OwnedMultiDeviceIterator on TPU Pod.
  - if self.extended.num_hosts > 1:
  - self._enable_legacy_iterators = True
  -
  # TODO(cjfj): Modify `_call_for_each_replica` in `TPUExtended` such that this
  # can use the default implementation.
  # This implementation runs a single step. It does not use infeed or outfeed.
  