Do not hide the web notification popups by the system tray, rather let them avoid (2nd)

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 "ash/ash_export.h"
 #include "ash/system/tray/system_tray_bubble.h"
 #include "ash/system/tray/tray_background_view.h"
@@ skipping 173 matching lines @@
   void ShowItems(const std::vector<SystemTrayItem*>& items,
                  bool details,
                  bool activate,
                  BubbleCreationType creation_type,
                  int x_offset);
 
   // Constructs or re-constructs |notification_bubble_| and populates it with
   // |notification_items_|, or destroys it if there are no notification items.
   void UpdateNotificationBubble();
 
+  // Checks the current status of the system tray and updates the web
+  // notification tray according to the current status.
+  void UpdateWebNotifications();
+
   const ScopedVector<SystemTrayItem>& items() const { return items_; }
 
   // Overridden from internal::ActionableView.
   virtual bool PerformAction(const ui::Event& event) OVERRIDE;
 
   // Owned items.
   ScopedVector<SystemTrayItem> items_;
 
   // Pointers to members of |items_|.
   SystemTrayItem* detailed_item_;
@@ skipping 22 matching lines @@
   bool full_system_tray_menu_;
 
   internal::TrayAccessibility* tray_accessibility_;  // not owned
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_