Fix unit test for 23588009

BUG=266903
TBR=derat@chromium.org, petewil@chromium.org

Review URL: https://codereview.chromium.org/24878002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225596 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 225596