Remove docked windows entirely in M59.

ash/common/wm/window_state.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_WINDOW_STATE_H_
 #define ASH_COMMON_WM_WINDOW_STATE_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 92 matching lines @@
   // WINDOW_STATE_TYPE_FULLSCREEN or WINDOW_STATE_TYPE_PINNED.
   bool IsMaximizedOrFullscreenOrPinned() const;
 
   // True if the window's state type is WINDOW_STATE_TYPE_NORMAL or
   // WINDOW_STATE_TYPE_DEFAULT.
   bool IsNormalStateType() const;
 
   bool IsNormalOrSnapped() const;
 
   bool IsActive() const;
-  bool IsDocked() const;
 
   // Returns true if the window's location can be controlled by the user.
   bool IsUserPositionable() const;
 
   // Checks if the window can change its state accordingly.
   bool CanMaximize() const;
   bool CanMinimize() const;
   bool CanResize() const;
   bool CanSnap() const;
   bool CanActivate() const;
@@ skipping 264 matching lines @@
 
   std::unique_ptr<State> current_state_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowState);
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WINDOW_STATE_H_