Remove an unused include from chrome/browser/chromeos/audio

chrome/browser/chromeos/audio/audio_devices_pref_handler_impl.cc

 // Copyright (c) 2013 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/audio/audio_devices_pref_handler_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/strings/string_number_conversions.h"
-#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/audio/audio_device.h"
 
 namespace {
 
 const double kDefaultOutputVolume = 75.0;
 const double kDefaultHDMIOutputVolume = 100.0;
 
 // Values used for muted preference.
 const int kPrefMuteOff = 0;
@@ skipping 199 matching lines @@
   registry->RegisterIntegerPref(prefs::kAudioMute, kPrefMuteOff);
 }
 
 // static
 AudioDevicesPrefHandler* AudioDevicesPrefHandler::Create(
     PrefService* local_state) {
   return new AudioDevicesPrefHandlerImpl(local_state);
 }
 
 }  // namespace chromeos