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. There is only X11 implementation of IsTouchpadEvent(), and it is used
  by DeviceUMA. But DeviceUMA also talks to DeviceDataManagerX11. So
  remove ui::IsTouchpadEvent(), and directly query DDMX11 whether the
  event is a touchpad event.

. Remove SetNaturalScroll() and IsNaturalScrollEnabled() since nothing uses
  these anymore (and there are no implementations of these either).

BUG=none
R=derat@chromium.org

Review URL: https://codereview.chromium.org/405683002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284306 0039d316-1c4b-4281-b951-d872f2087c98