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Author SHA1 Message Date
cgoldfeder
3ae646d687 Decouple SessionMetadata and TransportCredentials
TransportCredentials are per-request, not per-session, and
there's no reason to carry them within SessionMetadata.

While I'm in here, get rid of "null" credentials.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125202213
2016-06-27 16:14:57 -04:00