Move touchscreen_util.cc/h from ash to ui.

ash/touch/touchscreen_util.h

Index: ash/touch/touchscreen_util.h
diff --git a/ash/touch/touchscreen_util.h b/ash/touch/touchscreen_util.h
deleted file mode 100644
index 8d2f04c013cc7f8e0516652217a45b74ca02e732..0000000000000000000000000000000000000000
--- a/ash/touch/touchscreen_util.h
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ASH_TOUCH_TOUCHSCREEN_UTIL_H_
-#define ASH_TOUCH_TOUCHSCREEN_UTIL_H_
-
-#include <vector>
-
-#include "ash/ash_export.h"
-#include "ui/display/manager/managed_display_info.h"
-#include "ui/events/devices/touchscreen_device.h"
-
-namespace ash {
-
-// Given a list of displays and a list of touchscreens, associate them. The
-// information in |displays| will be updated to reflect the mapping.
-ASH_EXPORT void AssociateTouchscreens(
-    std::vector<display::ManagedDisplayInfo>* displays,
-    const std::vector<ui::TouchscreenDevice>& touchscreens);
-
-}  // namespace ash
-
-#endif  // ASH_TOUCH_TOUCHSCREEN_UTIL_H_