Oilpan: Replace all of PassRefPTR/RefPtr<Text> and PassRefPtr/RefPtr<CDATASection> with Oilpan transition types.

BUG=357163

Review URL: https://codereview.chromium.org/287523002

git-svn-id: svn://svn.chromium.org/blink/trunk@173944 bbb929c8-8fbe-4397-9dbb-9b2b20218538