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And remove an empty method and the caller on MicroBenchmark.

R=weiliangc@chromium.org

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I9750cbcf1daebf365f8e5bd91022dedf32e49ec4
Reviewed-on: https://chromium-review.googlesource.com/1103137
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568482}