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The reporting code no longer exists, and we haven't noticed missing this
histogram so it should be safe to expire.

Bug: 1089338
Change-Id: Iab50286cbdb4ddb3d403df83b6bfddafc50dd236
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640750Reviewed-by: Glenn Hartmann <hartmanng@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845650}