views: Forward declare "class View;" in layout_manager.h

views/layout/box_layout.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/box_layout.h"
 
+#include "gfx/insets.h"
+#include "gfx/rect.h"
+#include "views/view.h"
+
 namespace views {
 
 BoxLayout::BoxLayout(BoxLayout::Orientation orientation,
                      int inside_border_horizontal_spacing,
                      int inside_border_vertical_spacing,
                      int between_child_spacing)
     : orientation_(orientation),
       inside_border_horizontal_spacing_(inside_border_horizontal_spacing),
       inside_border_vertical_spacing_(inside_border_vertical_spacing),
       between_child_spacing_(between_child_spacing) {
 }
 
+BoxLayout::~BoxLayout() {
+}
+
 void BoxLayout::Layout(View* host) {
   gfx::Rect childArea(gfx::Rect(host->size()));
   childArea.Inset(host->GetInsets());
   childArea.Inset(inside_border_horizontal_spacing_,
                   inside_border_vertical_spacing_);
   int x = childArea.x();
   int y = childArea.y();
   for (int i = 0; i < host->GetChildViewCount(); ++i) {
     View* child = host->GetChildViewAt(i);
     if (child->IsVisible()) {
@@ skipping 31 matching lines @@
       position += between_child_spacing_;
     }
   }
   gfx::Insets insets(host->GetInsets());
   return gfx::Size(
       bounds.width() + insets.width() + 2 * inside_border_horizontal_spacing_,
       bounds.height() + insets.height() + 2 * inside_border_vertical_spacing_);
 }
 
 } // namespace views