content: fix duplicate the

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This PR (HEAD: b5c5874) has been imported to Gerrit for code review.

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Patch Set 1:

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Message from Bryan C. Mills:

Patch Set 1: Run-TryBot+1 Code-Review+2

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Message from Gobot Gobot:

Patch Set 1:

TryBots beginning. Status page: https://farmer.golang.org/try?commit=350bf0e9

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Patch Set 1: TryBot-Result+1

TryBots are happy.

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This PR is being closed because golang.org/cl/218802 has been merged.