Fix typo in comments, and update comment.
Fix typo in comments, and update comment.

This is really a patch from Ziad Hatahet, and can be seen
at http://codereview.chromium.org/2366006/show

R=ziadh
Review URL: http://codereview.chromium.org/2396001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@48550 0039d316-1c4b-4281-b951-d872f2087c98

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