Make LogoutButtonTray a regular View

ash/system/tray/system_tray.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_TRAY_SYSTEM_TRAY_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 68 matching lines @@
   void SetDetailedViewCloseDelay(int close_delay);
 
   // Hides the detailed view for |item|. If |animate| is false, disable
   // the hiding animation for hiding |item|.
   void HideDetailedView(SystemTrayItem* item, bool animate);
 
   // Updates the items when the login status of the system changes.
   void UpdateAfterLoginStatusChange(LoginStatus login_status);
 
   // Updates the items when the shelf alignment changes.
-  void UpdateAfterShelfAlignmentChange(ShelfAlignment alignment);
+  void UpdateItemsAfterShelfAlignmentChange();
 
   // Returns true if the shelf should be forced visible when auto-hidden.
   bool ShouldShowShelf() const;
 
   // Returns true if there is a system bubble (already visible or in the process
   // of being created).
   bool HasSystemBubble() const;
 
   // Returns true if the system_bubble_ exists and is of type |type|.
   bool HasSystemBubbleType(SystemTrayBubble::BubbleType type);
 
   // Returns a pointer to the system bubble or NULL if none.
   SystemTrayBubble* GetSystemBubble();
 
   // Returns true if system bubble is visible.
   bool IsSystemBubbleVisible() const;
 
   // Closes system bubble and returns true if it did exist.
   bool CloseSystemBubble() const;
 
   // Returns view for help button if default view is shown. Returns NULL
   // otherwise.
   views::View* GetHelpButtonView() const;
 
   // Returns TrayAudio object if present or null otherwise.
   TrayAudio* GetTrayAudio() const;
 
   // Overridden from TrayBackgroundView.
-  void SetShelfAlignment(ShelfAlignment alignment) override;
+  void UpdateAfterShelfAlignmentChange() override;
   void AnchorUpdated() override;
   base::string16 GetAccessibleNameForTray() override;
   void BubbleResized(const views::TrayBubbleView* bubble_view) override;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
   void ClickedOutsideBubble() override;
 
   // views::TrayBubbleView::Delegate:
   void BubbleViewDestroyed() override;
   void OnMouseEnteredView() override;
   void OnMouseExitedView() override;
@@ skipping 112 matching lines @@
   std::unique_ptr<KeyEventWatcher> key_event_watcher_;
 
   std::unique_ptr<ActivationObserver> activation_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_