Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/system/status_area_widget_delegate.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 ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/shelf_types.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
@@ skipping 13 matching lines @@
 
   // Add a tray view to the widget (e.g. system tray, web notifications).
   void AddTray(views::View* tray);
 
   // Called whenever layout might change (e.g. alignment changed).
   void UpdateLayout();
 
   // Sets the focus cycler.
   void SetFocusCyclerForTesting(const FocusCycler* focus_cycler);
 
-  void set_alignment(ShelfAlignment alignment) { alignment_ = alignment; }
+  void set_alignment(wm::ShelfAlignment alignment) { alignment_ = alignment; }
 
   // Overridden from views::AccessiblePaneView.
   View* GetDefaultFocusableChild() override;
 
   // Overridden from views::View:
   views::Widget* GetWidget() override;
   const views::Widget* GetWidget() const override;
 
   // Overridden from ui::EventHandler:
   void OnGestureEvent(ui::GestureEvent* event) override;
 
   // views::WidgetDelegate overrides:
   bool CanActivate() const override;
   void DeleteDelegate() override;
 
  protected:
   // Overridden from views::View:
   void ChildPreferredSizeChanged(views::View* child) override;
   void ChildVisibilityChanged(views::View* child) override;
 
  private:
   void UpdateWidgetSize();
 
   const FocusCycler* focus_cycler_for_testing_;
-  ShelfAlignment alignment_;
+  wm::ShelfAlignment alignment_;
 
   ShelfGestureHandler gesture_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_