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It updates several comments and renames member variables to increase clarity and
better match the style guide.

R=wtc@chromium.org

Review URL: https://codereview.chromium.org/448293002

Cr-Commit-Position: refs/heads/master@{#288282}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288282 0039d316-1c4b-4281-b951-d872f2087c98