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This member variable was added by crrev.com/c/659318, to show warning
for legacy Symantec roots from content::SSLManager. But
crrev.com/c/693315 stopped using it.

So this member variable is not used anymore.

Bug: 763984
Change-Id: Iffeb27972171bb0d231be6efd07c31cfcf2d951c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2137199Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756911}