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This allows passing arguments with move-only semantics.

Change-Id: I852eb343398e6f763abfe2a44e623f28353d79a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129029
Commit-Queue: Jeremy Apthorp <jeremya@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Auto-Submit: Jeremy Apthorp <jeremya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755196}