Oilpan: Workaround for crash on quora and geek-and-poke. There is a finalization issue that we need to resolve in CSSCursorImageValue.

R=erik.corry@gmail.com, haraken@chromium.org, wibling@chromium.org
BUG=347943
NOTRY=true

Review URL: https://codereview.chromium.org/185723006

git-svn-id: svn://svn.chromium.org/blink/trunk@168385 bbb929c8-8fbe-4397-9dbb-9b2b20218538