Remove dead RoundedMinimumValueForLength

Last use was removed in ae49f5caf2943049acab4abe802e82c8dc001184.

Change-Id: I226e8d7a629148d5c3cd869cf31f48cf909662bb
Reviewed-on: https://chromium-review.googlesource.com/c/1421997
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#624542}
2 files changed