Remove deprecated API usage in some of bindings/v8/custom

R=jochen@chromium.org, mkwst@chromium.org

Review URL: https://codereview.chromium.org/95103002

git-svn-id: svn://svn.chromium.org/blink/trunk@162843 bbb929c8-8fbe-4397-9dbb-9b2b20218538