Remove dead code related to Notification View Bubble

ash/common/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_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #define ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include <map>
 #include <memory>
 #include <vector>
@@ skipping 112 matching lines @@
   // 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;
 
-  // Accessors for testing.
-
-  // Returns true if the bubble exists.
-  bool CloseNotificationBubbleForTest() const;
-
   // Overridden from TrayBackgroundView.
   void SetShelfAlignment(ShelfAlignment alignment) 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;
@@ skipping 134 matching lines @@
   std::unique_ptr<KeyEventWatcher> key_event_watcher_;
 
   std::unique_ptr<ActivationObserver> activation_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_SYSTEM_TRAY_H_