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This field is unused except for displaying it in
chrome://sync-internals, and apparently it also always empty in
practice.

Bug: 1139903
Change-Id: Ib5345594dc6d5bc0bd5d967c8dd9d08ba3781e08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2484593Reviewed-by: Tim Schumann <tschumann@chromium.org>
Commit-Queue: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818470}