am a5273888: am 538abc5b: am d6aeae14: Merge "Don\'t serialize required fields whose \'has\' flags are unset."

* commit 'a5273888480392ff8a8b0ea3af6617e18dbb1ed2':
pull/91/head
Max Cai 11 years ago committed by Android Git Automerger
commit 6ceb306cca

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