IAM: Remove generate_identity_binding_access_token (via synth).

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Executing /tmpfs/src/git/autosynth/working_repo/iam/synth.py. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:b2a73f4dda03ef8fcaa973e3ba26d0cf34091f6c22c70add663af325931aef4d Status: Image is up to date for googleapis/artman:latest synthtool > Cloning googleapis. synthtool > Running generator for google/iam/credentials/artman_iamcredentials_v1.yaml. synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/iamcredentials-v1. synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/iam/credentials/v1/common.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/iamcredentials-v1/google/cloud/iam_credentials_v1/proto/common.proto synthtool > Copy: /home/kbuilder/.cache/synthtool/googleapis/google/iam/credentials/v1/iamcredentials.proto to /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/iamcredentials-v1/google/cloud/iam_credentials_v1/proto/iamcredentials.proto synthtool > Placed proto files into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/iamcredentials-v1/google/cloud/iam_credentials_v1/proto. synthtool > Replaced 'google-cloud-iamcredentials' in google/cloud/iam_credentials_v1/gapic/iam_credentials_client.py. synthtool > Replaced 'google-cloud-iamcredentials' in docs/conf.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import common_pb2' in google/cloud/iam_credentials_v1/types.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import common_pb2' in google/cloud/iam_credentials_v1/gapic/iam_credentials_client.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import common_pb2' in google/cloud/iam_credentials_v1/proto/iamcredentials_pb2_grpc.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import common_pb2' in google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import common_pb2' in tests/unit/gapic/v1/test_iam_credentials_client_v1.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import iamcredentials_pb2_grpc' in google/cloud/iam_credentials_v1/gapic/iam_credentials_client.py. synthtool > Replaced 'from google\\.iam\\.credentials\\.v1 import iamcredentials_pb2_grpc' in google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py. synthtool > Replaced '"""Attributes:\n' in google/cloud/iam_credentials_v1/proto/common_pb2.py. .coveragerc .flake8 MANIFEST.in noxfile.py.j2 setup.cfg Running session blacken Creating virtualenv using python3.6 in .nox/blacken pip install black black docs google tests noxfile.py setup.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/__init__.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/gapic/transports/iam_credentials_grpc_transport.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/gapic/iam_credentials_client_config.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/proto/common_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/docs/conf.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2_grpc.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/types.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/proto/iamcredentials_pb2.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/noxfile.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/gapic/iam_credentials_client.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/tests/unit/gapic/v1/test_iam_credentials_client_v1.py reformatted /tmpfs/src/git/autosynth/working_repo/iam/google/cloud/iam_credentials_v1/proto/common_pb2.py All done! ✨ 🍰 ✨ 15 files reformatted, 4 files left unchanged. Session blacken was successful. synthtool > Cleaned up 2 temporary directories. synthtool > Wrote metadata to synth.metadata.