Some nits I found while looking around rAc() code.

R=estade@chromium.org, groby@chromium.org
BUG=none
TEST=smaller diff in next CL

Review URL: https://codereview.chromium.org/98693017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243137 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243137