Mark decode-resize.html as flaky on Windows.

BUG=381373
TBR=peter@chromium.org

Review URL: https://codereview.chromium.org/319803002

git-svn-id: svn://svn.chromium.org/blink/trunk@175593 bbb929c8-8fbe-4397-9dbb-9b2b20218538