message: Delete the now-unused increment_var() internal DistributionStrategy function.
diff: @@ -31,7 +31,6 @@ from tensorflow.python.ops.losses import losses_impl
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import device_util
  from tensorflow.python.training import distribution_strategy_context
  -from tensorflow.python.util import deprecation
  from tensorflow.python.util import nest
  @@ -1293,27 +1292,6 @@ class _DefaultDistributionStrategy(DistributionStrategy):
  "_DefaultDistributionStrategy.")
  -# ------------------------------------------------------------------------------
  -# Deprecated, use v.assign_add(amount) instead. Internal API, so expect
  -# it to be deleted soon.
  -
  -
  -@deprecation.deprecated(None,
  - "Use v.assign_add(amount) instead. You may need to set "
  - "aggregation=tf.VariableAggregation.ONLY_FIRST_REPLICA "
  - "when creating the variable.")
  -def increment_var(v, amount=1):
  - """`v += amount`, distributed-aware version."""
  - def update(vu):
  - return vu.assign_add(amount, read_value=False)
  -
  - def merge_fn(dist, vm):
  - return dist.update(vm, update)
  -
  - replica_context = distribution_strategy_context.get_replica_context()
  - return replica_context.merge_call(merge_fn, v)
  -
  -
  # ------------------------------------------------------------------------------
  # We haven't yet implemented deserialization for DistributedVariables.
  # So here we catch any attempts to deserialize variables
  