Convert some more view methods to the ui/views style.

views/examples/widget_example.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/examples/widget_example.h"
 
 #include "views/controls/button/text_button.h"
 #include "views/layout/box_layout.h"
 #include "views/layout/layout_manager.h"
 #include "views/view.h"
 #include "views/widget/widget.h"
 
 namespace {
 
 // A layout manager that layouts a single child at
 // the center of the host view.
 class CenterLayout : public views::LayoutManager {
  public:
   CenterLayout() {}
   virtual ~CenterLayout() {}
 
   // Overridden from LayoutManager:
   virtual void Layout(views::View* host) {
-    views::View* child = host->GetChildViewAt(0);
+    views::View* child = host->child_at(0);
     gfx::Size size = child->GetPreferredSize();
     child->SetBounds((host->width() - size.width()) / 2,
                      (host->height() - size.height()) / 2,
                      size.width(), size.height());
   }
 
   virtual gfx::Size GetPreferredSize(views::View* host) {
     return gfx::Size();
   }
 
@@ skipping 127 matching lines @@
       CreateChild(sender, true);
       break;
 #endif
     case CLOSE_WIDGET:
       sender->GetWidget()->Close();
       break;
   }
 }
 
 }  // namespace examples