Fix for pointer settings when settings page is refreshed.

chrome/browser/chromeos/system/pointer_device_observer.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 CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_
 #pragma once
 
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "chrome/browser/chromeos/device_hierarchy_observer.h"
 
 namespace chromeos {
 namespace system {
 
 class PointerDeviceObserver : public DeviceHierarchyObserver {
  public:
   PointerDeviceObserver();
   virtual ~PointerDeviceObserver();
 
+  // Start observing device hierarchy.
   void Init();
 
+  // Check for presence of devices.
+  void CheckDevices();
+
   class Observer {
    public:
     virtual void TouchpadExists(bool exists) = 0;
     virtual void MouseExists(bool exists) = 0;
 
    protected:
     Observer() {}
     virtual ~Observer();
-
-   private:
-    DISALLOW_COPY_AND_ASSIGN(Observer);
   };
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
  private:
   // DeviceHierarchyObserver implementation.
   virtual void DeviceHierarchyChanged() OVERRIDE;
   virtual void DeviceAdded(int device_id) OVERRIDE {}
   virtual void DeviceRemoved(int device_id) OVERRIDE {}
   virtual void DeviceKeyPressedOrReleased(int device_id) OVERRIDE {}
 
-  // Check for input devices.
+  // Check for pointer devices.
   void CheckTouchpadExists();
   void CheckMouseExists();
 
-  // Callback for input device checks.
-  void TouchpadExists(bool* exists);
-  void MouseExists(bool* exists);
+  // Callback for pointer device checks.
+  void OnTouchpadExists(bool* exists);
+  void OnMouseExists(bool* exists);
 
   ObserverList<Observer> observers_;
 
   base::WeakPtrFactory<PointerDeviceObserver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PointerDeviceObserver);
 };
 
 }  // namespace system
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SYSTEM_POINTER_DEVICE_OBSERVER_H_