Revert of athena: Add a minimized state for the home-card.

athena/home/minimized_home.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 ATHENA_HOME_MINIMIZED_HOME_H_
-#define ATHENA_HOME_MINIMIZED_HOME_H_
-
-namespace aura {
-class Window;
-}
-
-namespace views {
-class Widget;
-}
-
-namespace athena {
-
-class MinimizedHomeDragDelegate {
- public:
-  virtual ~MinimizedHomeDragDelegate() {}
-
-  virtual void OnDragUpCompleted() = 0;
-};
-
-// Note that |delegate| is guaranteed to be alive as long as the returned widget
-// is alive.
-views::Widget* CreateMinimizedHome(aura::Window* container,
-                                   MinimizedHomeDragDelegate* delegate);
-
-}  // namespace athena
-
-#endif  // ATHENA_HOME_MINIMIZED_HOME_H_