DevTools: remove more Revealer usages from sdk/

This gets rid of remaining WebInspector.Revealer usage in
DOMModel and in OverridesSupport.js

BUG=

Review URL: https://codereview.chromium.org/394843002

git-svn-id: svn://svn.chromium.org/blink/trunk@178272 bbb929c8-8fbe-4397-9dbb-9b2b20218538