Add Flex to views::BoxLayout.

ui/message_center/views/message_center_view.cc

 // Copyright (c) 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 "ui/message_center/views/message_center_view.h"
 
 #include <list>
 #include <map>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 163 matching lines @@
                                  bool top_down)
     : message_center_view_(message_center_view),
       reposition_top_(-1),
       fixed_height_(0),
       has_deferred_task_(false),
       clear_all_started_(false),
       top_down_(top_down),
       weak_ptr_factory_(this) {
   views::BoxLayout* layout =
       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 1);
-  layout->set_main_axis_alignment(views::BoxLayout::MAIN_AXIS_ALIGNMENT_FILL);
+  layout->set_default_flex(1);
   SetLayoutManager(layout);
 
   // Set the margin to 0 for the layout. BoxLayout assumes the same margin
   // for top and bottom, but the bottom margin here should be smaller
   // because of the shadow of message view. Use an empty border instead
   // to provide this margin.
   gfx::Insets shadow_insets = MessageView::GetShadowInsets();
   set_background(views::Background::CreateSolidBackground(
       kMessageCenterBackgroundColor));
   SetBorder(views::Border::CreateEmptyBorder(
@@ skipping 803 matching lines @@
   scroller_->InvalidateLayout();
   PreferredSizeChanged();
   Layout();
 }
 
 void MessageCenterView::SetNotificationViewForTest(MessageView* view) {
   message_list_view_->AddNotificationAt(view, 0);
 }
 
 }  // namespace message_center