Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/system/web_notification/web_notification_tray.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/web_notification/web_notification_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
@@ skipping 285 matching lines @@
 void WebNotificationTray::ShowMessageCenterBubble() {
   if (!IsMessageCenterBubbleVisible())
     message_center_tray_->ShowMessageCenterBubble();
 }
 
 void WebNotificationTray::UpdateAfterLoginStatusChange(
     user::LoginStatus login_status) {
   OnMessageCenterTrayChanged();
 }
 
-void WebNotificationTray::SetShelfAlignment(ShelfAlignment alignment) {
+void WebNotificationTray::SetShelfAlignment(wm::ShelfAlignment alignment) {
   if (alignment == shelf_alignment())
     return;
   TrayBackgroundView::SetShelfAlignment(alignment);
   tray_container()->SetBorder(views::Border::NullBorder());
   // Destroy any existing bubble so that it will be rebuilt correctly.
   message_center_tray_->HideMessageCenterBubble();
   message_center_tray_->HidePopupBubble();
 }
 
 void WebNotificationTray::AnchorUpdated() {
@@ skipping 161 matching lines @@
 
 message_center::MessageCenterBubble*
 WebNotificationTray::GetMessageCenterBubbleForTest() {
   if (!message_center_bubble())
     return NULL;
   return static_cast<message_center::MessageCenterBubble*>(
       message_center_bubble()->bubble());
 }
 
 }  // namespace ash