Cleanup: Remove misc unneeded grit includes.

ash/system/chromeos/audio/tray_audio_delegate_chromeos.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/chromeos/audio/tray_audio_delegate_chromeos.h"
 
 #include "chromeos/audio/cras_audio_handler.h"
 #include "grit/ash_resources.h"
-#include "grit/ash_strings.h"
 
 using chromeos::CrasAudioHandler;
 
 namespace ash  {
 namespace system {
 
 void TrayAudioDelegateChromeOs::AdjustOutputVolumeToAudibleLevel() {
   CrasAudioHandler::Get()->AdjustOutputVolumeToAudibleLevel();
 }
 
@@ skipping 36 matching lines @@
 void TrayAudioDelegateChromeOs::SetOutputAudioIsMuted(bool is_muted) {
   CrasAudioHandler::Get()->SetOutputMute(is_muted);
 }
 
 void TrayAudioDelegateChromeOs::SetOutputVolumeLevel(int level) {
   CrasAudioHandler::Get()->SetOutputVolumePercent(level);
 }
 
 }  // namespace system
 }  // namespace ash