Reduce usage of MessageLoopProxy in base/

chrome/browser/media/media_device_id_salt.cc

 // Copyright 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/media/media_device_id_salt.h"
 
 #include "base/base64.h"
 #include "base/prefs/pref_service.h"
 #include "base/rand_util.h"
 #include "chrome/browser/profiles/profile_io_data.h"
 #include "chrome/common/pref_names.h"
@@ skipping 18 matching lines @@
 
   if (incognito) {
     incognito_salt_ = CreateSalt();
     return;
   }
 
   media_device_id_salt_.Init(prefs::kMediaDeviceIdSalt, pref_service);
   if (media_device_id_salt_.GetValue().empty())
     media_device_id_salt_.SetValue(CreateSalt());
 
-  media_device_id_salt_.MoveToThread(
+  media_device_id_salt_.UseAlternateTaskRunner(
       BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
 }
 
 MediaDeviceIDSalt::~MediaDeviceIDSalt() {
 }
 
 void MediaDeviceIDSalt::ShutdownOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (incognito_salt_.empty())
     media_device_id_salt_.Destroy();
@@ skipping 11 matching lines @@
   registry->RegisterStringPref(
       prefs::kMediaDeviceIdSalt,
       std::string(),
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 void MediaDeviceIDSalt::Reset(PrefService* pref_service) {
   pref_service->SetString(prefs::kMediaDeviceIdSalt,
                           CreateSalt());
 }