The only reason why it existed was so that we could get tests to print information in a consistent order and there are other ways of doing that. By removing compareTo we can use the properties of the extended ImmutableObject properly and properly implement the RFC https://tools.ietf.org/html/rfc5910#page-18
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=240170488