mash: Migrate AccessibilityDelegate access to WmShell.

ash/audio/sounds.cc

 // Copyright 2014 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/audio/sounds.h"
 
 #include "ash/common/accessibility_delegate.h"
 #include "ash/common/ash_switches.h"
-#include "ash/shell.h"
+#include "ash/common/wm_shell.h"
 #include "base/command_line.h"
 
 using media::SoundsManager;
 
 namespace ash {
 
 bool PlaySystemSoundAlways(SoundsManager::SoundKey key) {
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kAshDisableSystemSounds))
     return false;
   return SoundsManager::Get()->Play(key);
 }
 
 bool PlaySystemSoundIfSpokenFeedback(SoundsManager::SoundKey key) {
   base::CommandLine* cl = base::CommandLine::ForCurrentProcess();
   if (cl->HasSwitch(switches::kAshDisableSystemSounds))
     return false;
 
   if (cl->HasSwitch(switches::kAshEnableSystemSounds))
     return SoundsManager::Get()->Play(key);
 
-  Shell* shell = Shell::GetInstance();
-  if (!shell->accessibility_delegate()->IsSpokenFeedbackEnabled())
+  if (!WmShell::Get()->GetAccessibilityDelegate()->IsSpokenFeedbackEnabled())
     return false;
 
   return SoundsManager::Get()->Play(key);
 }
 
 }  // namespace ash