Use a direct include of strings headers in ui/, part 2.

ui/message_center/views/message_view.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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_VIEW_H_
 
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "ui/gfx/insets.h"
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/notification.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/slide_out_view.h"
 
 namespace views {
 class ImageButton;
 class ScrollView;
 }
@@ skipping 67 matching lines @@
   string16 accessible_name_;
 
   bool is_expanded_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageView);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_VIEWS_MESSAGE_VIEW_H_