Removes tray keyboard icon from the status area.

ash/system/chromeos/virtual_keyboard/tray_keyboard_lock.h

 // Copyright 2014 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_CHROMEOS_VIRTUAL_KEYBOARD_TRAY_KEYBOARD_LOCK_H
 #define ASH_SYSTEM_CHROMEOS_VIRTUAL_KEYBOARD_TRAY_KEYBOARD_LOCK_H
 
 #include "ash/shell_observer.h"
 #include "ash/system/chromeos/virtual_keyboard/virtual_keyboard_observer.h"
 #include "ash/system/tray/system_tray_notifier.h"
 #include "ash/system/tray/tray_image_item.h"
 #include "ash/system/tray_accessibility.h"
 #include "ash/wm/maximize_mode/maximize_mode_controller.h"
 
 namespace ash {
 
-// TrayKeyboardLock is a provider of views for the SystemTray. Both a tray view
-// and a default view are provided. Each view indicates the current state of
-// the virtual keyboard when an external keyboard is plugged in. The default
-// view can be interacted with, it toggles the state of the keyboard lock.
-class ASH_EXPORT TrayKeyboardLock : public TrayImageItem,
-                                    public VirtualKeyboardObserver,
-                                    public AccessibilityObserver {
+// TrayKeyboardLock is a provider of the default view for the SystemTray. This
+// view indicates the current state of the virtual keyboard when an external
+// keyboard is plugged in. The default view can be interacted with, it toggles
+// the state of the keyboard lock.
+class ASH_EXPORT TrayKeyboardLock : public SystemTrayItem,
+                                    public VirtualKeyboardObserver {
  public:
   explicit TrayKeyboardLock(SystemTray* system_tray);
   virtual ~TrayKeyboardLock();
 
   // VirtualKeyboardObserver
   virtual void OnKeyboardSuppressionChanged(bool suppressed) override;
 
   // SystemTrayItem:
   virtual views::View* CreateDefaultView(user::LoginStatus status) override;
 
-  // AccessibilityObserver:
-  void OnAccessibilityModeChanged(
-      ui::AccessibilityNotificationVisibility notify) override;
-
- protected:
-  // TrayImageItem:
-  virtual bool GetInitialVisibility() override;
-
  private:
   friend class TrayKeyboardLockTest;
 
-  // True if the virtual keyboard is suppressed by an external keyboard.
-  bool ShouldTrayBeVisible();
-
   // True if the on-screen keyboard is suppressed.
   bool virtual_keyboard_suppressed_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayKeyboardLock);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_VIRTUAL_KEYBOARD_TRAY_KEYBOARD_LOCK_H