Fix shelf layout when switching from left-aligned shelf to right-aligned shelf

ash/system/tray/system_tray.h

Index: ash/system/tray/system_tray.h
diff --git a/ash/system/tray/system_tray.h b/ash/system/tray/system_tray.h
index da3b780df9f8a652ef3e284e99ebe6813ff3cdec..20b26d729d91537534f60666da8b84c0354d6865 100644
--- a/ash/system/tray/system_tray.h
+++ b/ash/system/tray/system_tray.h
@@ -46,7 +46,8 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   // Calls TrayBackgroundView::Initialize(), creates the tray items, and
   // adds them to SystemTrayNotifier.
   void InitializeTrayItems(SystemTrayDelegate* delegate,
-                           WebNotificationTray* web_notification_tray);
+                           WebNotificationTray* web_notification_tray,
+                           const gfx::Insets& insets);
 
   // Resets internal pointers.
   void Shutdown();
@@ -130,7 +131,8 @@ class ASH_EXPORT SystemTray : public TrayBackgroundView,
   bool CloseNotificationBubbleForTest() const;
 
   // Overridden from TrayBackgroundView.
-  void SetShelfAlignment(ShelfAlignment alignment) override;
+  void SetShelfAlignment(ShelfAlignment alignment,
+                         const gfx::Insets& insets) override;
   void AnchorUpdated() override;
   base::string16 GetAccessibleNameForTray() override;
   void BubbleResized(const views::TrayBubbleView* bubble_view) override;