Re-mark gradient-with-scaled-ancestor.html as flaky and window-close-crash as crashing

on Win7 debug.

TBR=jsbell@chromium.org, fmalita@chromium.org
BUG=310327, 248155

Review URL: https://codereview.chromium.org/32003005

git-svn-id: svn://svn.chromium.org/blink/trunk@160256 bbb929c8-8fbe-4397-9dbb-9b2b20218538