Fixed Win32 compile of GetChildrenPriorResults.

The trybot was not building the env_chromium_unittests so this bug
slipped past.

BUG=324924

Review URL: https://codereview.chromium.org/98563007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239152 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239152