Fix status area accessability issues.

ash/system/status_area_widget_delegate.cc

 // Copyright (c) 2012 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 "ash/system/status_area_widget_delegate.h"
 
 #include "ash/ash_export.h"
 #include "ash/focus_cycler.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
@@ skipping 78 matching lines @@
   views::ColumnSet* columns = layout->AddColumnSet(0);
   if (alignment_ == SHELF_ALIGNMENT_BOTTOM) {
     for (int c = 0; c < child_count(); ++c) {
       if (c != 0)
         columns->AddPaddingColumn(0, kTraySpacing);
       columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::CENTER,
                          0, /* resize percent */
                          views::GridLayout::USE_PREF, 0, 0);
     }
     layout->StartRow(0, 0);
-    for (int c = 0; c < child_count(); ++c)
+    for (int c = child_count() - 1; c >= 0; --c)
       layout->AddView(child_at(c));
   } else {
     columns->AddColumn(views::GridLayout::CENTER, views::GridLayout::CENTER,
                        0, /* resize percent */
                        views::GridLayout::USE_PREF, 0, 0);
-    for (int c = 0; c < child_count(); ++c) {
-      if (c != 0)
+    for (int c = child_count() - 1; c >= 0; --c) {
+      if (c != child_count() - 1)
         layout->AddPaddingRow(0, kTraySpacing);
       layout->StartRow(0, 0);
       layout->AddView(child_at(c));
     }
   }
   Layout();
   UpdateWidgetSize();
 }
 
 void StatusAreaWidgetDelegate::ChildPreferredSizeChanged(View* child) {
   // Need to resize the window when trays or items are added/removed.
   UpdateWidgetSize();
 }
 
 void StatusAreaWidgetDelegate::UpdateWidgetSize() {
   if (GetWidget())
     GetWidget()->SetSize(GetPreferredSize());
 }
 
 }  // namespace internal
 }  // namespace ash