Remove TransparentActivateWindowButton from Overview Mode

ash/wm/overview/transparent_activate_window_button.h

-// 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_WM_OVERVIEW_TRANSPARENT_ACTIVATE_WINDOW_BUTTON_H_
-#define ASH_WM_OVERVIEW_TRANSPARENT_ACTIVATE_WINDOW_BUTTON_H_
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/strings/string16.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace aura {
-class Window;
-}  // namespace aura
-
-namespace views {
-class Button;
-class Widget;
-}  // namespace views
-
-namespace ash {
-
-class TransparentActivateWindowButtonDelegate;
-
-// Transparent window that covers window selector items and handles mouse and
-// gestures on overview mode for them.
-class TransparentActivateWindowButton {
- public:
-  TransparentActivateWindowButton(
-      aura::Window* root_window,
-      TransparentActivateWindowButtonDelegate* delegate);
-  ~TransparentActivateWindowButton();
-
-  // Sets the accessibility name.
-  void SetAccessibleName(const base::string16& name);
-
-  // Sets the bounds of the transparent window.
-  void SetBounds(const gfx::Rect& bounds);
-
-  // Sends an accessibility focus alert so that if chromevox is enabled, the
-  // window title is read.
-  void SendFocusAlert() const;
-
-  // Stacks |this| above |activate_button| in the window z-ordering.
-  void StackAbove(TransparentActivateWindowButton* activate_button);
-
- private:
-  // The transparent window event handler widget itself.
-  scoped_ptr<views::Widget> event_handler_widget_;
-
-  // The transparent button view that handles user input. Not owned.
-  views::Button* transparent_button_;
-
-  DISALLOW_COPY_AND_ASSIGN(TransparentActivateWindowButton);
-};
-
-}  // namespace ash
-
-#endif  // ASH_WM_OVERVIEW_TRANSPARENT_ACTIVATE_WINDOW_BUTTON_H_