Remove unused ColoredWindowController/DesktopBackgroundFadeController

ash/wm/workspace/desktop_background_fade_controller.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_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_
-#define ASH_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_
-
-#include "ash/ash_export.h"
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/compositor/layer_animation_observer.h"
-
-namespace aura {
-class Window;
-}
-
-namespace base {
-class TimeDelta;
-}
-
-namespace ash {
-namespace internal {
-
-class ColoredWindowController;
-
-// DesktopBackgroundFadeController handles fading in or out the desktop. It is
-// used when maximizing or restoring a window. It is implemented as a colored
-// layer whose opacity varies. This results in fading in or out all the windows
-// the DesktopBackgroundFadeController is placed on top of. This is used
-// instead of varying the opacity for two reasons:
-// . The window showing background and the desktop workspace do not have a
-//   common parent that can be animated. This could be fixed, but wouldn't
-//   address the following.
-// . When restoring the window is moved back to the desktop workspace. If we
-//   animated the opacity of the desktop workspace the cross fade would be
-//   effected.
-class ASH_EXPORT DesktopBackgroundFadeController
-    : public ui::ImplicitAnimationObserver {
- public:
-  // Direction to fade.
-  enum Direction {
-    FADE_IN,
-    FADE_OUT,
-  };
-
-  // Creates a new DesktopBackgroundFadeController. |parent| is the Window to
-//   parent the newly created window to. The newly created window is stacked
-//   directly on top of |position_above|. The window animating the fade is
-//   destroyed as soon as the animation completes.
-  DesktopBackgroundFadeController(aura::Window* parent,
-                                  aura::Window* position_above,
-                                  base::TimeDelta duration,
-                                  Direction direction);
-  virtual ~DesktopBackgroundFadeController();
-
- private:
-  // ImplicitAnimationObserver overrides:
-  virtual void OnImplicitAnimationsCompleted() OVERRIDE;
-
-  scoped_ptr<ColoredWindowController> window_controller_;
-
-  DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundFadeController);
-};
-
-}  // namespace internal
-}  // namespace ash
-
-#endif  // ASH_WM_WORKSPACE_DESKTOP_BACKGROUND_FADE_CONTROLLER_H_