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StatsHistograms is the only "external" subclass of base::Histogram and as such
it often requires extra considerations when modifying the base class. On the
other hand, almost the same data can be gathered by using a regular log
histogram with a specific range.

This CL does that, generating a 75 bucket histogram to map the 27 buckets
from the original data. Most of the buckets will be empty, and a couple of
buckets will be merged on the new histogram, but the compromise looks
good enough.

BUG=377936

Review URL: https://codereview.chromium.org/295913014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273074 0039d316-1c4b-4281-b951-d872f2087c98