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The field is redundant and consuming it can be a source for issues,
possibly vulnerabilities. Therefore, let's deprecate it and only
populate it for the cases where we require backward-compatibility.

Bug: 967417
Change-Id: I2875d5c24b12bff68606a4f83be2d5b9381e660b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1826677
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Maksim Moskvitin <mmoskvitin@google.com>
Cr-Commit-Position: refs/heads/master@{#700207}