Add Flex to views::BoxLayout.

chrome/browser/ui/views/message_center/message_center_widget_delegate.cc

 // Copyright 2013 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 "chrome/browser/ui/views/message_center/message_center_widget_delegate.h"
 
 #include <complex>
 
 #include "chrome/browser/ui/views/message_center/message_center_frame_view.h"
 #include "chrome/browser/ui/views/message_center/web_notification_tray.h"
@@ skipping 31 matching lines @@
                             ALIGNMENT_TOP,  // Show buttons on top if message
                                             // center is top aligned
                         title),
       pos_info_(pos_info),
       tray_(tray) {
   // A WidgetDelegate should be deleted on DeleteDelegate.
   set_owned_by_client();
 
   views::BoxLayout* layout =
       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 0);
-  layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_FILL);
+  layout->SetDefaultFlex(1);
   SetLayoutManager(layout);
 
   AddAccelerator(ui::Accelerator(ui::VKEY_ESCAPE, ui::EF_NONE));
 
   SetPaintToLayer(true);
   SetFillsBoundsOpaquely(true);
 
   InitWidget();
 }
 
@@ skipping 173 matching lines @@
     bounds.set_y(corrected_anchor.y() - size.height());
   if (pos_info_.message_center_alignment & ALIGNMENT_LEFT)
     bounds.set_x(corrected_anchor.x());
   if (pos_info_.message_center_alignment & ALIGNMENT_RIGHT)
     bounds.set_x(corrected_anchor.x() - size.width());
 
   return bounds;
 }
 
 }  // namespace message_center