ash: Clean up shelf GetAlignment() and IsHorizontalAlignment() calls

ash/common/shelf/shelf_widget.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_COMMON_SHELF_SHELF_WIDGET_H_
 #define ASH_COMMON_SHELF_SHELF_WIDGET_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 26 matching lines @@
                                public ShelfBackgroundAnimatorObserver,
                                public ShelfLayoutManagerObserver {
  public:
   ShelfWidget(WmWindow* shelf_container, WmShelf* wm_shelf);
   ~ShelfWidget() override;
 
   void CreateStatusAreaWidget(WmWindow* status_container);
 
   void OnShelfAlignmentChanged();
 
-  // DEPRECATED: Prefer WmShelf::GetAlignment().
-  ShelfAlignment GetAlignment() const;
-
   // Sets the shelf's background type.
   void SetPaintsBackground(ShelfBackgroundType background_type,
                            BackgroundAnimatorChangeType change_type);
   ShelfBackgroundType GetBackgroundType() const;
 
   // Hide the shelf behind a black bar during e.g. a user transition when |hide|
   // is true. The |animation_time_ms| will be used as animation duration.
   void HideShelfBehindBlackBar(bool hide, int animation_time_ms);
   bool IsShelfHiddenBehindBlackBar() const;
 
@@ skipping 63 matching lines @@
   ShelfView* shelf_view_;
   ShelfBackgroundAnimator background_animator_;
   bool activating_as_fallback_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfWidget);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SHELF_SHELF_WIDGET_H_