Coverity: pass VisitRow by const ref
Coverity: pass VisitRow by const ref

CIDs: 103409,103410,103411

BUG=none
TEST=compile

Review URL: https://chromiumcodereview.appspot.com/9560004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@124358 0039d316-1c4b-4281-b951-d872f2087c98

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