Make LogoutButtonTray a regular View

ash/system/virtual_keyboard/virtual_keyboard_tray.h

Index: ash/system/virtual_keyboard/virtual_keyboard_tray.h
diff --git a/ash/system/virtual_keyboard/virtual_keyboard_tray.h b/ash/system/virtual_keyboard/virtual_keyboard_tray.h
index df8bad6d14b51458c329c691b10da4cd83bc17ce..92c43775e02c703347cbdbac4fbc8c39e2a3fc13 100644
--- a/ash/system/virtual_keyboard/virtual_keyboard_tray.h
+++ b/ash/system/virtual_keyboard/virtual_keyboard_tray.h
@@ -25,7 +25,6 @@ class VirtualKeyboardTray : public TrayBackgroundView,
   ~VirtualKeyboardTray() override;
 
   // TrayBackgroundView:
-  void SetShelfAlignment(ShelfAlignment alignment) override;
   base::string16 GetAccessibleNameForTray() override;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
   void ClickedOutsideBubble() override;
@@ -39,10 +38,6 @@ class VirtualKeyboardTray : public TrayBackgroundView,
   void OnKeyboardClosed() override;
 
  private:
-  // Creates a new border for the icon. The padding is determined based on the
-  // alignment of the shelf.
-  void SetIconBorderForShelfAlignment();
-
   void ObserveKeyboardController();
   void UnobserveKeyboardController();