Add test expectation for http/tests/security/img-crossorigin-no-credentials-prompt.html

NOTRY=true
TBR=sigbjornf@opera.se
BUG=426078

Review URL: https://codereview.chromium.org/671983002

git-svn-id: svn://svn.chromium.org/blink/trunk@184209 bbb929c8-8fbe-4397-9dbb-9b2b20218538