Replace more ObserverList with base::ObserverList.

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"
@@ skipping 35 matching lines @@
   // propagating notifications.
   void EnableNotifications() { enabled_ = true; }
   void DisableNotifications() { enabled_ = false; }
 
  private:
   friend struct DefaultSingletonTraits<WidgetFocusManager>;
 
   WidgetFocusManager();
   ~WidgetFocusManager();
 
-  ObserverList<WidgetFocusChangeListener> focus_change_listeners_;
+  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_