Oilpan: make DataObject and SharedWorker heap Supplementables.

With heap supplement{able}s support now in place, follow up and turn
the supplements of these two into garbage allocated objects also.

R=haraken@chromium.org
BUG=340522

Review URL: https://codereview.chromium.org/200373003

git-svn-id: svn://svn.chromium.org/blink/trunk@169733 bbb929c8-8fbe-4397-9dbb-9b2b20218538