Suppressed Win7 (dbg) failure of editing/spelling/inline-spelling-markers-hidpi.html .

BUG=315913
TBR=antonm@chromium.org

Review URL: https://codereview.chromium.org/60663006

git-svn-id: svn://svn.chromium.org/blink/trunk@161478 bbb929c8-8fbe-4397-9dbb-9b2b20218538