Remove PrefServiceSimple, replacing it with PrefService and PrefRegistrySimple.

chrome/browser/metrics/variations/variations_service.cc

 // Copyright (c) 2012 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/metrics/variations/variations_service.h"
 
 #include <set>
 
 #include "base/base64.h"
 #include "base/build_time.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/version.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/metrics/proto/trials_seed.pb.h"
+#include "chrome/browser/prefs/pref_registrar_simple.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/metrics/variations/variations_util.h"
 #include "chrome/common/pref_names.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/url_fetcher.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/load_flags.h"
 #include "net/base/network_change_notifier.h"
 #include "net/http/http_response_headers.h"
@@ skipping 125 matching lines @@
 
   // Perform the first fetch.
   FetchVariationsSeed();
 
   // Repeat this periodically.
   timer_.Start(FROM_HERE, base::TimeDelta::FromHours(kSeedFetchPeriodHours),
                this, &VariationsService::FetchVariationsSeed);
 }
 
 // static
-void VariationsService::RegisterPrefs(PrefServiceSimple* prefs) {
-  prefs->RegisterStringPref(prefs::kVariationsSeed, std::string());
+void VariationsService::RegisterPrefs(PrefRegistrarSimple* prefs) {
+  prefs
+->RegisterStringPref(prefs::kVariationsSeed, std::string());
   prefs->RegisterInt64Pref(prefs::kVariationsSeedDate,
                            base::Time().ToInternalValue());
 }
 
 void VariationsService::SetCreateTrialsFromSeedCalledForTesting(bool called) {
   create_trials_from_seed_called_ = called;
 }
 
 void VariationsService::DoActualFetch() {
   pending_seed_request_.reset(net::URLFetcher::Create(
@@ skipping 336 matching lines @@
                                       variation_id);
     }
   }
 
   trial->SetForced();
   if (IsStudyExpired(study, reference_date))
     trial->Disable();
 }
 
 }  // namespace chrome_variations