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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: Ide054101bd01cb64d697106fb5ec85b88137c1bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476609Reviewed-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@{#819044}