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This reverts commit 9b53f52e.

Reason for revert: Causing server pipeline breakage

Original change's description:
> Migrate U-Z histograms to patterned histogram syntax
>
> This is part of a migration that replaces the old
> <histogram-suffixes> syntax that was used to denote groups
> of histogram to the new patterned histogram syntax.
>
> Bug: 758782
> Change-Id: I6cde5e15fb8d43b58006569ca01cab5765fb79e3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552631
> Reviewed-by: Weilun Shi <sweilun@chromium.org>
> Reviewed-by: Ilya Sherman <isherman@chromium.org>
> Commit-Queue: Karthika Pai <karthikapai@google.com>
> Cr-Commit-Position: refs/heads/master@{#832494}

TBR=isherman@chromium.org,sweilun@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,karthikapai@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 758782
Change-Id: I1e6f202496d6bf30f18828ddb8a1ba2647f2eec6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574779Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833876}