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Replace '.' in histogram-suffixes name with '_'

This is a no-op for histogram generation but it brings a huge benefit
for us to migrate suffixes to patterned histograms. i.e. '.' in the
string placeholder is not supported in string.format().

This is generated by a script:
  histogram_suffixes.setAttribute('name',
      histogram_suffixes.getAttribute('name').replace('.', '_'))

Bug: 758782
Change-Id: Ie0315911fc1d635fd5c697c198c013ee7a88037b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466900
Auto-Submit: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816856}