py3: remove argparse_util helper

tensorboard/BUILD

@@ -214,7 +214,6 @@ py_library(
         "//tensorboard/backend/event_processing:data_ingester",
         "//tensorboard/backend/event_processing:event_file_inspector",
         "//tensorboard/data:server_ingester",
-        "//tensorboard/util:argparse_util",
         "@org_pocoo_werkzeug",
         "@org_pythonhosted_six",
     ],

tensorboard/program.py

@@ -60,7 +60,6 @@
 from tensorboard.backend.event_processing import event_file_inspector as efi
 from tensorboard.data import server_ingester
 from tensorboard.plugins.core import core_plugin
-from tensorboard.util import argparse_util
 from tensorboard.util import tb_logging
 
 
@@ -230,10 +229,7 @@ def configure(self, argv=("",), **kwargs):
 
         arg0 = argv[0] if argv else ""
 
-        with argparse_util.allow_missing_subcommand():
-            flags = base_parser.parse_args(
-                argv[1:]
-            )  # Strip binary name from argv.
+        flags = base_parser.parse_args(argv[1:])  # Strip binary name from argv.
         if getattr(flags, _SUBCOMMAND_FLAG, None) is None:
             # Manually assign default value rather than using `set_defaults`
             # on the base parser to work around Python bug #9351 on old

tensorboard/util/BUILD

@@ -4,23 +4,6 @@ package(default_visibility = ["//tensorboard:internal"])
 
 licenses(["notice"])
 
-py_library(
-    name = "argparse_util",
-    srcs = ["argparse_util.py"],
-    srcs_version = "PY3",
-)
-
-py_test(
-    name = "argparse_util_test",
-    size = "small",
-    srcs = ["argparse_util_test.py"],
-    srcs_version = "PY3",
-    deps = [
-        ":argparse_util",
-        "//tensorboard:test",
-    ],
-)
-
 py_library(
     name = "encoder",
     srcs = ["encoder.py"],