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It's called only once. Use move semantics and make that clear.

Change-Id: I6f6e41a19a8198b9821c7c17d53d1f2c2ca09fef
Reviewed-on: https://chromium-review.googlesource.com/c/1313056Reviewed-by: Paul Miller <paulmiller@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605059}