Remove usage of deprecated Object::New and Integer::New calls from tests

BUG=none
TBR=dcarney@chromium.org

Review URL: https://codereview.chromium.org/93603007

git-svn-id: svn://svn.chromium.org/blink/trunk@164450 bbb929c8-8fbe-4397-9dbb-9b2b20218538