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It's used only by arc::ArcSessionManager.

Change-Id: I2bc0844ed29c12571f21cd8bc67e3ac81e3bd62c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531153Reviewed-by: Long Cheng <lgcheng@google.com>
Commit-Queue: Yuichiro Hanada <yhanada@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826099}