Revert of Support modal windows

athena/screen/modal_window_controller.h

Index: athena/screen/modal_window_controller.h
diff --git a/athena/screen/modal_window_controller.h b/athena/screen/modal_window_controller.h
deleted file mode 100644
index b4c7ec5b3033fd7784d04d66840e35f8b7852729..0000000000000000000000000000000000000000
--- a/athena/screen/modal_window_controller.h
+++ /dev/null
@@ -1,59 +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 ATHENA_SCREEN_MODAL_WINDOW_CONTROLLER_H_
-#define ATHENA_SCREEN_MODAL_WINDOW_CONTROLLER_H_
-
-#include "athena/athena_export.h"
-#include "ui/aura/window_observer.h"
-
-namespace athena {
-
-// ModalWindow controller manages the modal window and
-// its container. This gets created when a modal window is opened
-// and deleted when all modal windows are deleted.
-class ATHENA_EXPORT ModalWindowController : public aura::WindowObserver {
- public:
-  // Returns the ModalWindowController associated with the container.
-  static ModalWindowController* Get(aura::Window* container);
-
-  explicit ModalWindowController(int container_priority);
-  virtual ~ModalWindowController();
-
-  aura::Window* modal_container() { return modal_container_; }
-
-  bool dimmed() const { return dimmed_; }
-
- private:
-  // aura::WindowObserver:
-  virtual void OnWindowAdded(aura::Window* child) override;
-  virtual void OnWindowVisibilityChanged(aura::Window* window,
-                                         bool visible) override;
-  virtual void OnWindowBoundsChanged(aura::Window* window,
-                                     const gfx::Rect& old_bounds,
-                                     const gfx::Rect& new_bounds) override;
-  virtual void OnWindowDestroyed(aura::Window* window) override;
-
-  // Tells if the child is not a dimmer window and a child of the modal
-  // container.
-  bool IsChildWindow(aura::Window* child) const;
-
-  void UpdateDimmerWindowBounds();
-
-  // Change dimming state based on the visible window in the container.
-  void UpdateDimming(aura::Window* ignore);
-
-  // Note: changing true -> false will delete the modal_container_.
-  void SetDimmed(bool dimmed);
-
-  aura::Window* modal_container_;  // not owned.
-  aura::Window* dimmer_window_;    // not owned.
-
-  bool dimmed_;
-  DISALLOW_COPY_AND_ASSIGN(ModalWindowController);
-};
-
-}  // namespace athena
-
-#endif  // ATHENA_SCREEN_MODAL_WINDOW_CONTROLLER_H_