[Chrome OS MD] Draw a 1px separator between 2 tray items

ash/common/system/web_notification/web_notification_tray.cc

Index: ash/common/system/web_notification/web_notification_tray.cc
diff --git a/ash/common/system/web_notification/web_notification_tray.cc b/ash/common/system/web_notification/web_notification_tray.cc
index 9b7d7d2cd4ee6edb7510aa0c403a05aac70e6af1..393ca08a99842f9dad47cb29b8deff4c72ffb513 100644
--- a/ash/common/system/web_notification/web_notification_tray.cc
+++ b/ash/common/system/web_notification/web_notification_tray.cc
@@ -215,7 +215,6 @@ WebNotificationTray::WebNotificationTray(WmShelf* shelf,
 
   tray_container()->AddChildView(icon_);
   SetContentsBackground();
-  tray_container()->SetBorder(views::Border::NullBorder());
   message_center_tray_.reset(new message_center::MessageCenterTray(
       this, message_center::MessageCenter::Get()));
   popup_alignment_delegate_.reset(new AshPopupAlignmentDelegate(shelf));
@@ -342,9 +341,6 @@ void WebNotificationTray::SetShelfAlignment(ShelfAlignment alignment) {
   if (alignment == shelf_alignment())
     return;
   TrayBackgroundView::SetShelfAlignment(alignment);
-  // Every time shelf alignment is updated, StatusAreaWidgetDelegate resets the
-  // border to a non-null border. So, we need to remove it.
-  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();