Cleanup shelf initialization and observation.

ash/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_SHELF_SHELF_WIDGET_H_
 #define ASH_SHELF_SHELF_WIDGET_H_
 
 #include "ash/ash_export.h"
 #include "ash/shelf/background_animator.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
@@ skipping 14 matching lines @@
 
 class ASH_EXPORT ShelfWidget : public views::Widget,
                                public views::WidgetObserver,
                                public ShelfLayoutManagerObserver {
  public:
   ShelfWidget(aura::Window* shelf_container,
               aura::Window* status_container,
               WorkspaceController* workspace_controller);
   ~ShelfWidget() override;
 
-  // Returns if shelf alignment option is enabled, and the user is able
-  // to adjust the alignment (guest and supervised mode users cannot for
-  // example).
+  // Returns if shelf alignment option is enabled, and the user is able to
+  // adjust the alignment (guest and supervised mode users cannot for example).
   static bool ShelfAlignmentAllowed();
 
-  void SetAlignment(ShelfAlignment alignmnet);
+  void OnShelfAlignmentChanged();
   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);
@@ skipping 57 matching lines @@
   // during CloseChildWindows of the associated RootWindowController.
   DelegateView* delegate_view_;
   BackgroundAnimator background_animator_;
   bool activating_as_fallback_;
   aura::Window* window_container_;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_WIDGET_H_