orderfile: cleanup: actually remove --new-commit-flow

The usage of the flag was removed in crrev.com/719331. I planned to
remove the declaration of the flag separately to make reverts smaller,
but forgot to remove it in the end. Do it now.

Bug: 1028600
Change-Id: Ia2cb8bd18389c25e440c2c95773b4c49ce120d64
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2017405
Commit-Queue: Egor Pasko <pasko@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Auto-Submit: Egor Pasko <pasko@chromium.org>
Reviewed-by: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734524}

tools/cygprofile/orderfile_generator_backend.py

@@ -1134,8 +1134,6 @@ def CreateArgumentParser():
   parser.add_argument('--commit-hashes', action='store_true',
                       help=('Commit any orderfile hash files in the current '
                             'checkout; performs no other action'))
-  parser.add_argument('--new-commit-flow', action='store_true', default=True,
-                      help='Use the new two-step commit flow.')
   parser.add_argument('--use-call-graph', action='store_true', default=False,
                       help='Use call graph instrumentation.')
   profile_android_startup.AddProfileCollectionArguments(parser)