Move Singleton and related structs to namespace base

ui/views/focus/widget_focus_manager.h

 // Copyright (c) 2011 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 UI_VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_
 #define UI_VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/views_export.h"
 
+namespace base {
 template <typename T> struct DefaultSingletonTraits;
+}
 
 namespace views {
 
 // This interface should be implemented by classes that want to be notified when
 // the native focus is about to change.  Listeners implementing this interface
 // will be invoked for all native focus changes across the entire Chrome
 // application.  FocusChangeListeners are only called for changes within the
 // children of a single top-level native-view.
 class WidgetFocusChangeListener {
  public:
@@ skipping 17 matching lines @@
   // null when focus is lost.
   void OnNativeFocusChanged(gfx::NativeView focused_now);
 
   // Enable/Disable notification of registered listeners during calls
   // to OnNativeFocusChanged.  Used to prevent unwanted focus changes from
   // propagating notifications.
   void EnableNotifications() { enabled_ = true; }
   void DisableNotifications() { enabled_ = false; }
 
  private:
-  friend struct DefaultSingletonTraits<WidgetFocusManager>;
+  friend struct base::DefaultSingletonTraits<WidgetFocusManager>;
 
   WidgetFocusManager();
   ~WidgetFocusManager();
 
   base::ObserverList<WidgetFocusChangeListener> focus_change_listeners_;
 
   bool enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(WidgetFocusManager);
 };
 
 // A basic helper class that is used to disable native focus change
 // notifications within a scope.
 class VIEWS_EXPORT AutoNativeNotificationDisabler {
  public:
   AutoNativeNotificationDisabler();
   ~AutoNativeNotificationDisabler();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AutoNativeNotificationDisabler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_FOCUS_WIDGET_FOCUS_MANAGER_H_