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Also to be consistent with dm_api.proto which is used on DMServer:
cl/293161272.

The field is not yet used anywhere, so it's safe to rename.

Change-Id: Ib348ae4c0504a71cfebf0df516b26afecfb971e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2035988Reviewed-by: Pavol Marko <pmarko@chromium.org>
Commit-Queue: Askar Aitzhan <askaraitzhan@google.com>
Cr-Commit-Position: refs/heads/master@{#738369}