Remove NewDeviceOrientationController from DOMWindow.

NewDeviceOrientationController is now an ExecutionContext
Supplement so it can be removed from DOMWindow completely.

BUG=

Review URL: https://codereview.chromium.org/60063002

git-svn-id: svn://svn.chromium.org/blink/trunk@161349 bbb929c8-8fbe-4397-9dbb-9b2b20218538