DevTools: remove WebInspector.resourceTreeModel usages; migrate database, dom storage, filesystem models to targets.

R=sergeyv@chromium.org

Review URL: https://codereview.chromium.org/227543003

git-svn-id: svn://svn.chromium.org/blink/trunk@170976 bbb929c8-8fbe-4397-9dbb-9b2b20218538