Oilpan: Move all supplements of Page, Document, and WorkerClients to the managed heap.

R=ager@chromium.org
BUG=

Review URL: https://codereview.chromium.org/255983003

git-svn-id: svn://svn.chromium.org/blink/trunk@172990 bbb929c8-8fbe-4397-9dbb-9b2b20218538