Rename NewDeviceOrientationController -> DeviceOrientationController.

Now that the migration from the old implementation is complete, there
is no need for the "New" prefix.

BUG=

Review URL: https://codereview.chromium.org/64283002

git-svn-id: svn://svn.chromium.org/blink/trunk@161553 bbb929c8-8fbe-4397-9dbb-9b2b20218538