views: Move box_layout.[cc,h] into the new layout directory.

views/layout/box_layout.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 VIEWS_BOX_LAYOUT_H_
-#define VIEWS_BOX_LAYOUT_H_
+#ifndef VIEWS_LAYOUT_BOX_LAYOUT_H_
+#define VIEWS_LAYOUT_BOX_LAYOUT_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "views/layout_manager.h"
 
 namespace views {
 
 // A Layout manager that arranges child views vertically or horizontally in a
 // side-by-side fashion with spacing around and between the child views. The
 // child views are always sized according to their preferred size. If the
@@ skipping 28 matching lines @@
   const int inside_border_vertical_spacing_;
 
   // Spacing to put in between child views.
   const int between_child_spacing_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(BoxLayout);
 };
 
 } // namespace views
 
-#endif // VIEWS_BOX_LAYOUT_H_
+#endif // VIEWS_LAYOUT_BOX_LAYOUT_H_