Measure usage for Node API removed from DOM4

Measure usage for the following Node API that was removed from DOM4:
- isSupported()
- namespaceURI
- prefix
- isSameNode()

This will help us determine if we can deprecate this API or we it
should be reintroduced in DOM4.

Specification:
http://dom.spec.whatwg.org/#node

R=arv
BUG=272149

Review URL: https://chromiumcodereview.appspot.com/22816007

git-svn-id: svn://svn.chromium.org/blink/trunk@156037 bbb929c8-8fbe-4397-9dbb-9b2b20218538