Move nodesFromRect from Document to Internals

This method isn't actually a DOM API and it's used anywhere except
in tests. We can move it to Internals to make it clear it shouldn't
be used by anything except tests.

Review URL: https://chromiumcodereview.appspot.com/13824008

git-svn-id: svn://svn.chromium.org/blink/trunk@149152 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed