Remove docked windows entirely in M59.

ui/views/widget/native_widget_aura.h

 // Copyright (c) 2012 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 UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 186 matching lines @@
   int OnDragUpdated(const ui::DropTargetEvent& event) override;
   void OnDragExited() override;
   int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
  protected:
   ~NativeWidgetAura() override;
 
   internal::NativeWidgetDelegate* delegate() { return delegate_; }
 
  private:
-  bool IsDocked() const;
   void SetInitialFocus(ui::WindowShowState show_state);
 
   internal::NativeWidgetDelegate* delegate_;
 
   // True if the Widget is created in the window-manager and another client is
   // embedded in it. When true certain operations are not performed.
   const bool is_parallel_widget_in_window_manager_;
 
   // WARNING: set to NULL when destroyed. As the Widget is not necessarily
   // destroyed along with |window_| all usage of |window_| should first verify
@@ skipping 23 matching lines @@
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_