message: [XLA:Python] Remove some backward compatibility code from the Python API.
  Preceding changes have already broken compatibility with older JAX releases, so we can remove this compatibility code also.
diff: @@ -185,30 +185,6 @@ def get_local_backend(name=None):
  return list(backends.values())[-1]
  -# Compatibility shims to support older clients.
  -
  -_default_platform_name = None
  -
  -
  -def XlaLocalBackend():
  - # Deprecated. Use get_local_backend(platform_name).
  - return get_local_backend(_default_platform_name)
  -
  -
  -def initialize_platform_name(platform_name):
  - """Deprecated. Use get_local_backend(platform_name)."""
  - if platform_name == 'Host':
  - platform_name = 'cpu'
  - elif platform_name == 'CUDA':
  - platform_name = 'gpu'
  -
  - # Make sure the platform is valid by trying to instantiate it.
  - get_local_backend(platform_name)
  -
  - global _default_platform_name
  - _default_platform_name = platform_name
  -
  -
  class OpMetadata(object):
  """Python representation of a xla.OpMetadata protobuf."""
  __slots__ = ('op_type', 'op_name', 'source_file', 'source_line')
  