Fix SerializedScriptValueTest for oilpan build. Used transition types for ref counted objects.

TBR=costan@gmail.com, haraken@chromium.org, oilpan-reviews@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/444943003

git-svn-id: svn://svn.chromium.org/blink/trunk@179606 bbb929c8-8fbe-4397-9dbb-9b2b20218538