Gardening: test expectations update

The below one is flaky on linux/mac,fail on win
fast/dom/Window/open-window-min-size.html

The below three are passing
fast/events/scroll-event-during-modal-dialog.html
fast/events/show-modal-dialog-onblur-onfocus.html
fast/harness/show-modal-dialog.html

BUG=345831
TEST=
TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/198503006

git-svn-id: svn://svn.chromium.org/blink/trunk@169379 bbb929c8-8fbe-4397-9dbb-9b2b20218538