Make members of Singleton<T> private and only visible to the singleton type.

views/focus/focus_manager.h

 // Copyright (c) 2006-2008 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 VIEWS_FOCUS_FOCUS_MANAGER_H_
 #define VIEWS_FOCUS_FOCUS_MANAGER_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 108 matching lines @@
                                      gfx::NativeView focused_now) = 0;
 
  protected:
   virtual ~WidgetFocusChangeListener() {}
 };
 
 class FocusManager {
  public:
   class WidgetFocusManager {
    public:
+    // Returns the singleton instance.
+    static WidgetFocusManager* GetInstance();
+
     // Adds/removes a WidgetFocusChangeListener |listener| to the set of
     // active listeners.
     void AddFocusChangeListener(WidgetFocusChangeListener* listener);
     void RemoveFocusChangeListener(WidgetFocusChangeListener* listener);
 
     // To be called when native-focus shifts from |focused_before| to
     // |focused_now|.
     // TODO(port) : Invocations to this routine are only implemented for
     // the Win32 platform.  Calls need to be placed appropriately for
     // non-Windows environments.
@@ skipping 193 matching lines @@
   ~AutoNativeNotificationDisabler() {
     FocusManager::GetWidgetFocusManager()->EnableNotifications();
   }
  private:
   DISALLOW_COPY_AND_ASSIGN(AutoNativeNotificationDisabler);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_FOCUS_FOCUS_MANAGER_H_