GitLab

Update all histogram_tester.h includes in //cc to include
//base/test/metrics/histogram_tester.h

TBR=enne@chromium.org

Bug: 846421
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I74c3466b6e9986c1263be4b3c8fb79d2fbebf5b0
Reviewed-on: https://chromium-review.googlesource.com/1086243Reviewed-by: enne <enne@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564335}