Prefix string16 with base:: in ui/.

ui/message_center/views/group_view.h

 // Copyright 2013 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_MESSAGE_CENTER_VIEWS_GROUP_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_GROUP_VIEW_H_
 
 #include "ui/gfx/image/image_skia.h"
 #include "ui/message_center/views/message_center_controller.h"
 #include "ui/message_center/views/message_center_view.h"
@@ skipping 33 matching lines @@
                              const ui::Event& event) OVERRIDE;
 
   // Overridden from MessageViewController:
   virtual void ClickOnNotification(const std::string& notification_id) OVERRIDE;
   virtual void RemoveNotification(const std::string& notification_id,
                                   bool by_user) OVERRIDE;
 
  private:
   MessageCenterController* controller_;  // Weak, controls lifetime of views.
   NotifierId notifier_id_;
-  string16 display_source_;
+  base::string16 display_source_;
   gfx::ImageSkia group_icon_;
   int group_size_;
   std::string last_notification_id_;
 
   // Weak references to GroupView descendants owned by their parents.
   views::View* top_view_;
   views::View* bottom_view_;
   BoundedLabel* title_view_;
   BoundedLabel* message_view_;
   BoundedLabel* context_message_view_;
   views::View* icon_view_;
   NotificationButton* more_button_;
 
   DISALLOW_COPY_AND_ASSIGN(GroupView);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_VIEWS_GROUP_VIEW_H_