Remove PrefService::ScheduleSavePersistentPrefs and SavePersistentPrefs.

chrome/browser/chromeos/audio_mixer_alsa.cc

 // Copyright (c) 2011 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_mixer_alsa.h"
 
 #include <unistd.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 124 matching lines @@
     base::AutoLock lock(lock_);
     if (isnan(volume_db)) {
       LOG(WARNING) << "Got request to set volume to NaN";
       volume_db = min_volume_db_;
     } else {
       volume_db = min(max(volume_db, min_volume_db_), max_volume_db_);
     }
   }
 
   prefs_->SetDouble(prefs::kAudioVolume, volume_db);
-  prefs_->ScheduleSavePersistentPrefs();
 
   base::AutoLock lock(lock_);
   volume_db_ = volume_db;
   if (!apply_is_pending_)
     thread_->message_loop()->PostTask(FROM_HERE,
         base::Bind(&AudioMixerAlsa::ApplyState, base::Unretained(this)));
 }
 
 bool AudioMixerAlsa::IsMuted() {
   base::AutoLock lock(lock_);
   return is_muted_;
 }
 
 void AudioMixerAlsa::SetMuted(bool muted) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   prefs_->SetInteger(prefs::kAudioMute, muted ? kPrefMuteOn : kPrefMuteOff);
-  prefs_->ScheduleSavePersistentPrefs();
   base::AutoLock lock(lock_);
   is_muted_ = muted;
   if (!apply_is_pending_)
     thread_->message_loop()->PostTask(FROM_HERE,
         base::Bind(&AudioMixerAlsa::ApplyState, base::Unretained(this)));
 }
 
 // static
 void AudioMixerAlsa::RegisterPrefs(PrefService* local_state) {
   // TODO(derat): Store audio volume percent instead of decibels.
@@ skipping 276 matching lines @@
   if (alsa_result != 0) {
     LOG(WARNING) << "snd_mixer_selem_set_playback_switch_all() failed: "
                  << snd_strerror(alsa_result);
   } else {
     VLOG(1) << "Set playback switch " << snd_mixer_selem_get_name(element)
             << " to " << mute;
   }
 }
 
 }  // namespace chromeos