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The member is kept up to date in code, but only read in tests.

Change-Id: I2a1fb25e9ac51e2e26d2b38365df55b502d3c7af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2634861
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844854}