Turn of ash notification tray by default for M21.

chrome/browser/chromeos/extensions/file_browser_notifications.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 "chrome/browser/chromeos/extensions/file_browser_notifications.h"
 
 #include "ash/ash_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/message_loop.h"
@@ skipping 117 matching lines @@
 
   NotificationMessage(FileBrowserNotifications* host,
                       Profile* profile,
                       NotificationType type,
                       const std::string& notification_id,
                       const string16& message)
       : profile_(profile),
         type_(type),
         notification_id_(notification_id),
         message_(message) {
-    if (!CommandLine::ForCurrentProcess()->HasSwitch(
-            ash::switches::kAshNotifyDisabled)) {
+    if (CommandLine::ForCurrentProcess()->HasSwitch(
+            ash::switches::kAshNotify)) {
       const gfx::ImageSkia& icon =
           *ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
               IDR_FILES_APP_ICON);
       notification_id_ = DesktopNotificationService::AddIconNotification(
           GURL(), GetTitle(type_), message, icon,
           new Delegate(host->AsWeakPtr(), notification_id_), profile_);
     } else {
       system_notification_.reset(
           new chromeos::SystemNotification(profile_,
                                            notification_id_,
@@ skipping 241 matching lines @@
 void FileBrowserNotifications::HideNotificationById(const std::string& id) {
   NotificationMap::iterator it = notification_map_.find(id);
   if (it != notification_map_.end()) {
     delete it->second;
     notification_map_.erase(it);
   } else {
     // Mark as hidden so it does not get shown from a delayed task.
     hidden_notifications_.insert(id);
   }
 }