Sync generated files step is failing:

To https://chromium.googlesource.com/chromium/src/out
 ! [remote rejected]     HEAD -> master (prohibited by Gerrit)
error: failed to push some refs to 'https://chromium.googlesource.com/chromium/src/out'
Traceback (most recent call last):
  File "/b/build/scripts/slave/sync_generated_files_codesearch.py", line 65, in <module>
    sys.exit(main())
  File "/b/build/scripts/slave/sync_generated_files_codesearch.py", line 53, in main
    check_call(['git', 'push', 'origin', 'HEAD:master'], cwd=opts.dest)
  File "/b/build/scripts/slave/sync_generated_files_codesearch.py", line 61, in check_call
    return subprocess.check_call(cmd, cwd=cwd)
  File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['git', 'push', 'origin', 'HEAD:master']' returned non-zero exit status 1
step returned non-zero exit code: 1
@@@STEP_FAILURE@@@

See https://build.chromium.org/p/chromium.infra.codesearch/builders/codesearch-gen-chromium-android/builds/6 for more details.

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