views: Move layout_manager.[cc,h] into layout directory.

views/layout_manager.cc

Index: views/layout_manager.cc
diff --git a/views/layout_manager.cc b/views/layout_manager.cc
deleted file mode 100644
index 800dbc266644bdc62d8c97c9f20588346894c502..0000000000000000000000000000000000000000
--- a/views/layout_manager.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2006-2008 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.
-
-#include "views/layout_manager.h"
-
-#include "views/view.h"
-
-namespace views {
-
-int LayoutManager::GetPreferredHeightForWidth(View* host, int width) {
-  return GetPreferredSize(host).height();
-}
-
-}  // namespace views