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This is a general cleanup of some minor issues, mostly style and
comments, for SSLHostStateDelegate and related classes and methods. This
was done originally as a C++ readability review request, originally
based on https://codereview.chromium.org/369703002/.

Review URL: https://codereview.chromium.org/441043005

Cr-Commit-Position: refs/heads/master@{#293443}