Add test suppression for http/tests/security/shape-image-cors.html.

TBR=yhirano
BUG=431778

Review URL: https://codereview.chromium.org/713073002

git-svn-id: svn://svn.chromium.org/blink/trunk@185052 bbb929c8-8fbe-4397-9dbb-9b2b20218538