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... instead of naming them just so that arraysize can be used (instead
of ARRAYSIZE_UNSAFE), since C++11 removes this restriction. Also remove
some comments about this.

(Note that the change was automatically formatted, as required by the
presubmit check. Arguably, the entire file should be reformatted for
consistency, but that should be done separately.)

R=ajuma@chromium.org
BUG=423134

Review URL: https://codereview.chromium.org/660103002

Cr-Commit-Position: refs/heads/master@{#299989}