Remove ash_shell audio system tray item on Windows.

ash/system/tray/system_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/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/common/shelf/wm_shelf_util.h"
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/system/date/tray_date.h"
@@ skipping 49 matching lines @@
 #include "ash/system/chromeos/screen_security/screen_share_tray_item.h"
 #include "ash/system/chromeos/session/tray_session_length_limit.h"
 #include "ash/system/chromeos/settings/tray_settings.h"
 #include "ash/system/chromeos/supervised/tray_supervised_user.h"
 #include "ash/system/chromeos/tray_caps_lock.h"
 #include "ash/system/chromeos/tray_display.h"
 #include "ash/system/chromeos/tray_tracing.h"
 #include "ash/system/ime/tray_ime_chromeos.h"
 #include "ash/system/tray/media_security/multi_profile_media_tray_item.h"
 #include "ui/message_center/message_center.h"
-#elif defined(OS_WIN)
-#include "ash/system/win/audio/tray_audio_win.h"
-#include "media/audio/win/core_audio_util_win.h"
 #endif
 
 using views::TrayBubbleView;
 
 namespace ash {
 
 // The minimum width of the system tray menu width.
 const int kMinimumSystemTrayMenuWidth = 300;
 
 // Class to initialize and manage the SystemTrayBubble and TrayBubbleWrapper
@@ skipping 123 matching lines @@
   AddTrayItem(new MultiProfileMediaTrayItem(this));
   AddTrayItem(new TrayAudioChromeOs(this));
   AddTrayItem(new TrayBrightness(this));
   AddTrayItem(new TrayCapsLock(this));
   AddTrayItem(new TrayRotationLock(this));
   AddTrayItem(new TraySettings(this));
   AddTrayItem(tray_update_);
   AddTrayItem(tray_date_);
 #elif defined(OS_WIN)
   AddTrayItem(tray_accessibility_);
-  if (media::CoreAudioUtil::IsSupported())
-    AddTrayItem(new TrayAudioWin(this));
   AddTrayItem(tray_update_);
   AddTrayItem(tray_date_);
 #endif
 
   SetVisible(ash::WmShell::Get()
                  ->system_tray_delegate()
                  ->GetTrayVisibilityOnStartup());
 }
 
 void SystemTray::AddTrayItem(SystemTrayItem* item) {
@@ skipping 537 matching lines @@
           .work_area()
           .height();
   if (work_area_height > 0) {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Ash.SystemMenu.PercentageOfWorkAreaHeightCoveredByMenu",
         100 * bubble_view->height() / work_area_height, 1, 300, 100);
   }
 }
 
 }  // namespace ash