Revert 137549 because it broke win_aura and linux_chromeos_clang compile.

ash/touch/touch_observer_hud.h

-// Copyright (c) 2012 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_TOUCH_OBSERVER_HUD_H_
-#define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
-#pragma once
-
-#include "ash/shell.h"
-#include "ui/aura/event_filter.h"
-#include "ui/gfx/point.h"
-
-namespace aura {
-class MouseEvent;
-class KeyEvent;
-class Window;
-}
-
-namespace views {
-class Label;
-class Widget;
-}
-
-namespace ash {
-namespace internal {
-
-// An event filter which handles system level gesture events.
-class TouchObserverHUD : public aura::EventFilter {
- public:
-  TouchObserverHUD();
-  virtual ~TouchObserverHUD();
-
- private:
-  void UpdateTouchPointLabel(int index);
-
-  // Overriden from aura::EventFilter:
-  virtual bool PreHandleKeyEvent(aura::Window* target,
-                                 aura::KeyEvent* event) OVERRIDE;
-  virtual bool PreHandleMouseEvent(aura::Window* target,
-                                   aura::MouseEvent* event) OVERRIDE;
-  virtual ui::TouchStatus PreHandleTouchEvent(aura::Window* target,
-                                              aura::TouchEvent* event) OVERRIDE;
-  virtual ui::GestureStatus PreHandleGestureEvent(
-      aura::Window* target,
-      aura::GestureEvent* event) OVERRIDE;
-
-  static const int kMaxTouchPoints = 32;
-  scoped_ptr<views::Widget> widget_;
-  views::Label* touch_labels_[kMaxTouchPoints];
-  gfx::Point touch_positions_[kMaxTouchPoints];
-  ui::EventType touch_status_[kMaxTouchPoints];
-
-  DISALLOW_COPY_AND_ASSIGN(TouchObserverHUD);
-};
-
-}  // namespace internal
-}  // namespace ash
-
-#endif  // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_