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This field was introduced by
https://chromium-review.googlesource.com/c/chromium/src/+/727826/

... and became unnecessary by
https://chromium-review.googlesource.com/c/chromium/src/+/823374/

Bug: n/a
Change-Id: Ib0bb149d9480cb9981135b22b64ff9cb1094cd47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132901
Commit-Queue: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756578}