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

views/layout/layout_manager.cc

+// 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.
+
+#include "views/layout/layout_manager.h"
+
+namespace views {
+
+LayoutManager::~LayoutManager() {
+}
+
+void LayoutManager::Installed(View* host) {
+}
+
+void LayoutManager::Uninstalled(View* host) {
+}
+
+int LayoutManager::GetPreferredHeightForWidth(View* host, int width) {
+  return GetPreferredSize(host).height();
+}
+
+void LayoutManager::ViewAdded(View* host, View* view) {
+}
+
+void LayoutManager::ViewRemoved(View* host, View* view) {
+}
+
+}  // namespace views