Remove dead code related to Notification View Bubble

ash/common/system/status_area_widget.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/common/system/status_area_widget.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/system/chromeos/ime_menu/ime_menu_tray.h"
 #include "ash/common/system/chromeos/palette/palette_tray.h"
@@ skipping 130 matching lines @@
     return true;
 
   if (ime_menu_tray_ && ime_menu_tray_->ShouldBlockShelfAutoHide())
     return true;
 
   if (!wm_shelf_->IsVisible())
     return false;
 
   // If the shelf is currently visible, don't hide the shelf if the mouse
   // is in any of the notification bubbles.
-  return (system_tray_ && system_tray_->IsMouseInNotificationBubble()) ||
-         (web_notification_tray_ &&
-          web_notification_tray_->IsMouseInNotificationBubble());
+  return system_tray_ && system_tray_->IsMouseInNotificationBubble();
 }
 
 bool StatusAreaWidget::IsMessageBubbleShown() const {
   return ((system_tray_ && system_tray_->IsAnyBubbleVisible()) ||
           (web_notification_tray_ &&
            web_notification_tray_->IsMessageCenterBubbleVisible()));
 }
 
 void StatusAreaWidget::SchedulePaint() {
   status_area_widget_delegate_->SchedulePaint();
@@ skipping 72 matching lines @@
   ime_menu_tray_ = new ImeMenuTray(wm_shelf_);
   status_area_widget_delegate_->AddTray(ime_menu_tray_);
 }
 
 void StatusAreaWidget::AddOverviewButtonTray() {
   overview_button_tray_ = new OverviewButtonTray(wm_shelf_);
   status_area_widget_delegate_->AddTray(overview_button_tray_);
 }
 
 }  // namespace ash