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These are throwing off our reporting metrics, and aren't interesting to
record.

Bug: 978225
Change-Id: I78882e53f32acd74e2cf8513b72774e8e7312b8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674785
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Madeleine Barowsky <mbarowsky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678491}