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Change-Id can be accidentally deleted from an in-flight CL *, in which
case we need to add it back so that the exporter can find the export PR
later.

* https://crbug.com/gerrit/12244

Bug: 1032044
Change-Id: I9796e4a1e13dc8e2f617d9e45e7d2cb1a4ee61f2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2065132
Auto-Submit: Robert Ma <robertma@chromium.org>
Commit-Queue: Philip Jägenstedt <foolip@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743905}