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

views/layout/box_layout.h

Index: views/layout/box_layout.h
diff --git a/views/box_layout.h b/views/layout/box_layout.h
similarity index 90%
rename from views/box_layout.h
rename to views/layout/box_layout.h
index 2e86d9b93f6d63b76580618eb088fc404548124c..f7c2b1d0ecee3c5c85a3cfcc68fbc8b98b65f109 100644
--- a/views/box_layout.h
+++ b/views/layout/box_layout.h
@@ -1,9 +1,9 @@
-// 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"
@@ -52,4 +52,4 @@ class BoxLayout : public LayoutManager {
 
 } // namespace views
 
-#endif // VIEWS_BOX_LAYOUT_H_
+#endif // VIEWS_LAYOUT_BOX_LAYOUT_H_