Gardening: fast/dom/Geolocation/window-close-crash.html crashes Win7 dbg

Marking as such until the fix in the bug is reviewed and landed.

BUG=310326
TBR=jsbell

Review URL: https://codereview.chromium.org/38673004

git-svn-id: svn://svn.chromium.org/blink/trunk@160409 bbb929c8-8fbe-4397-9dbb-9b2b20218538