[Perf] Delete dummy_benchmark.histogram_benchmark_1

No longer needed.

Change-Id: I48e7073aba7861d7265337996c3ce6146d972f50
Reviewed-on: https://chromium-review.googlesource.com/c/1282220
Commit-Queue: Ethan Kuefner <eakuefner@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#600169}
14 files changed