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This CL corrects some typoes added in in crrev.com/c/1468144:

1. The ServiceWorkerCache.Cache.*.Match histogram contains its
   own values in addition to have child suffixes.  It should not be
   marked as a pure base.
2. The ServiceWorkerCache.CacheStorage operation suffixes were applied
   to the ServiceWorkerCache.Cache.* histograms incorrectly.

Bug: 927537
Change-Id: I3d46f1aca0b6d7f90ee14a8b18694cfeb5b0f51a
Reviewed-on: https://chromium-review.googlesource.com/c/1481470Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#634742}