Do not include attributes which are inherited.
Also some extra comments.
Review URL: http://codereviews.googleopensourceprograms.com/1603
# Please sort this file in alphabetical order by last (given) name.
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"Todd Larsen" <tlarsen@google.com>
"Chen Lunpeng" <forever.clp@gmail.com>
"Sverre Rabbelier" <sverre@rabbelier.nl>
"Pawel Solyga" <pawel.solyga@gmail.com>