ash: Remove a few unused includes.

ash/system/win/audio/tray_audio_delegate_win.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/system/win/audio/tray_audio_delegate_win.h"
 
 #include <audiopolicy.h>
 #include <cmath>
 
-#include "grit/ash_resources.h"
-#include "grit/ash_strings.h"
 #include "media/audio/win/core_audio_util_win.h"
 
 using base::win::ScopedComPtr;
 
 namespace {
 
 // Volume value which should be considered as muted in range [0, 100].
 const int kMuteThresholdPercent = 1;
 
 // Lowest volume which is considered to be audible in the range [0, 100].
@@ skipping 86 matching lines @@
   }
 
   session_manager->GetSimpleAudioVolume(NULL, FALSE,
       volume_control.Receive());
 
   return volume_control;
 }
 
 }  // namespace system
 }  // namespace ash