mash: Convert WebNotificationTray to wm common types

ui/message_center/views/desktop_popup_alignment_delegate.cc

 // Copyright 2014 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/desktop_popup_alignment_delegate.h"
 
 #include "ui/display/display.h"
 #include "ui/display/screen.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/message_center/message_center_style.h"
@@ skipping 65 matching lines @@
   // the taskbar is on the top or bottom.
   // Since on some platforms like Ubuntu Unity there's also a launcher along
   // with a taskbar (panel), we need to check that there is really nothing at
   // the top before concluding that the taskbar is at the left.
   alignment_ |= (work_area_.x() > display.bounds().x() &&
                  work_area_.y() == display.bounds().y())
       ? POPUP_ALIGNMENT_LEFT
       : POPUP_ALIGNMENT_RIGHT;
 }
 
+void DesktopPopupAlignmentDelegate::ConfigureWidgetInitParamsForContainer(
+    views::Widget* widget,
+    views::Widget::InitParams* init_params) {
+  // Do nothing, which will use the default container.
+}
+
 void DesktopPopupAlignmentDelegate::OnDisplayAdded(
     const display::Display& new_display) {}
 
 void DesktopPopupAlignmentDelegate::OnDisplayRemoved(
     const display::Display& old_display) {}
 
 void DesktopPopupAlignmentDelegate::OnDisplayMetricsChanged(
     const display::Display& display,
     uint32_t metrics) {
   if (display.id() == display_id_) {
     RecomputeAlignment(display);
     DoUpdateIfPossible();
   }
 }
 
 }  // namespace message_center