Refactor preference syncing.

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 <cmath>
 #include <unistd.h>
 
 #include <alsa/asoundlib.h>
@@ skipping 180 matching lines @@
   base::AutoLock lock(mixer_state_lock_);
   // If we think it's ready, verify it is actually so.
   if ((mixer_state_ == READY) && (alsa_mixer_ == NULL))
     mixer_state_ = IN_ERROR;
   return mixer_state_;
 }
 
 // static
 void AudioMixerAlsa::RegisterPrefs(PrefService* local_state) {
   if (!local_state->FindPreference(prefs::kAudioVolume))
-    local_state->RegisterDoublePref(prefs::kAudioVolume, kPrefVolumeInvalid);
+    local_state->RegisterDoublePref(prefs::kAudioVolume,
+                                    kPrefVolumeInvalid,
+                                    PrefService::UNSYNCABLE_PREF);
   if (!local_state->FindPreference(prefs::kAudioMute))
-    local_state->RegisterIntegerPref(prefs::kAudioMute, kPrefMuteInvalid);
+    local_state->RegisterIntegerPref(prefs::kAudioMute,
+                                     kPrefMuteInvalid,
+                                     PrefService::UNSYNCABLE_PREF);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // Private functions follow
 
 void AudioMixerAlsa::DoInit(InitDoneCallback* callback) {
   bool success = false;
   for (int num_attempts = 0; num_attempts < kMaxInitAttempts; ++num_attempts) {
     success = InitializeAlsaMixer();
     if (success) {
@@ skipping 334 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(elem)
             << " to " << enabled;
   }
 }
 
 }  // namespace chromeos