fast/dom/navigator-{with-content-}detached-no-crash.html no longer leaks.

With the leak addressed, sync LeakExpectations.

TBR=kouhei@chromium.org
BUG=385384
NOTRY=true

Review URL: https://codereview.chromium.org/614923003

git-svn-id: svn://svn.chromium.org/blink/trunk@182929 bbb929c8-8fbe-4397-9dbb-9b2b20218538