Remove docked windows entirely in M59.

ash/common/wm/dock/docked_window_layout_manager_observer.h

-// Copyright 2013 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_COMMON_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_
-#define ASH_COMMON_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_
-
-#include "ash/ash_export.h"
-
-namespace gfx {
-class Rect;
-}
-
-namespace ash {
-
-// Observers to the DockedWindowLayoutManager are notified of significant
-// events that occur with the docked windows, such as the bounds change.
-class ASH_EXPORT DockedWindowLayoutManagerObserver {
- public:
-  // Reason for notification. Allows selectively ignoring notifications to
-  // prevent a notification loop.
-  enum Reason {
-    CHILD_CHANGED,
-    DISPLAY_RESIZED,
-    DISPLAY_INSETS_CHANGED,
-    SHELF_ALIGNMENT_CHANGED,
-    KEYBOARD_BOUNDS_CHANGING
-  };
-  // Called after the dock bounds are changed.
-  virtual void OnDockBoundsChanging(const gfx::Rect& new_bounds,
-                                    Reason reason) = 0;
-
- protected:
-  virtual ~DockedWindowLayoutManagerObserver() {}
-};
-
-}  // namespace ash
-
-#endif  // ASH_COMMON_WM_DOCK_DOCKED_WINDOW_LAYOUT_MANAGER_OBSERVER_H_