Remove unused "sync_promo.error_message" preference

chrome/browser/prefs/browser_prefs.cc

 // Copyright 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/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 215 matching lines @@
 };
 
 // A previous feature (see
 // chrome/browser/protector/protected_prefs_watcher.cc in source
 // control history) used this string as a prefix for various prefs it
 // registered. We keep it here for now to clear out those old prefs in
 // MigrateUserPrefs.
 const char kBackupPref[] = "backup";
 
 #if !defined(OS_ANDROID)
-// The sync promo error message preference has been removed; this pref will
-// be cleared from user data.
-const char kSyncPromoErrorMessage[] = "sync_promo.error_message";
-
 // The AutomaticProfileResetter service used this preference to save that the
 // profile reset prompt had already been shown, however, the preference has been
 // renamed in Local State. We keep the name here for now so that we can clear
 // out legacy values.
 // TODO(engedy): Remove this and usages in M42 or later. See crbug.com/398813.
 const char kLegacyProfileResetPromptMemento[] = "profile.reset_prompt_memento";
 #endif
 
 }  // namespace
 
@@ skipping 277 matching lines @@
 #if defined(USE_ASH)
   ash::RegisterChromeLauncherUserPrefs(registry);
 #endif
 
   // Preferences registered only for migration (clearing or moving to a new key)
   // go here.
   registry->RegisterDictionaryPref(
       kBackupPref,
       new base::DictionaryValue(),
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
-#if !defined(OS_ANDROID)
-  registry->RegisterStringPref(
-      kSyncPromoErrorMessage,
-      std::string(),
-      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
-#endif
 }
 
 void RegisterUserProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   RegisterProfilePrefs(registry);
 
 #if defined(OS_CHROMEOS)
   chromeos::PowerPrefs::RegisterUserProfilePrefs(registry);
 #endif
 }
 
 void RegisterScreenshotPrefs(PrefRegistrySimple* registry) {
   registry->RegisterBooleanPref(prefs::kDisableScreenshots, false);
 }
 
 #if defined(OS_CHROMEOS)
 void RegisterLoginProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   RegisterProfilePrefs(registry);
 
   chromeos::PowerPrefs::RegisterLoginProfilePrefs(registry);
 }
 #endif
 
 void MigrateUserPrefs(Profile* profile) {
   PrefService* prefs = profile->GetPrefs();
 
   // Cleanup prefs from now-removed protector feature.
   prefs->ClearPref(kBackupPref);
 
 #if !defined(OS_ANDROID)
-  // Cleanup now-removed sync promo error message preference.
-  // TODO(fdoray): Remove this when it's safe to do so (crbug.com/268442).
-  prefs->ClearPref(kSyncPromoErrorMessage);
   // Migrate kNetworkPredictionEnabled to kNetworkPredictionOptions when not on
   // Android.  On Android, platform-specific code performs preference migration.
   // TODO(bnc): https://crbug.com/401970  Remove migration code one year after
   // M38.
   chrome_browser_net::MigrateNetworkPredictionUserPrefs(prefs);
 #endif
 
   PromoResourceService::MigrateUserPrefs(prefs);
   translate::TranslatePrefs::MigrateUserPrefs(prefs, prefs::kAcceptLanguages);
 
@@ skipping 99 matching lines @@
       host_zoom_dictionary, false /* sanitize_partition_host_zoom_levels */);
 
   // We're done migrating the profile per-host zoom level values, so we clear
   // them all.
   DictionaryPrefUpdate host_zoom_dictionary_update(
       prefs, prefs::kPerHostZoomLevelsDeprecated);
   host_zoom_dictionary_update->Clear();
 }
 
 }  // namespace chrome