[Gardening] Update image-set test expectations.

Fix landed, suppressions are no longer needed.

BUG=269627
TBR=bruno.d@partner.samsung.com

Review URL: https://codereview.chromium.org/22768002

git-svn-id: svn://svn.chromium.org/blink/trunk@155886 bbb929c8-8fbe-4397-9dbb-9b2b20218538