Remove kDistroDict from Preferences.

chrome/browser/prefs/chrome_pref_service_factory.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/prefs/chrome_command_line_pref_store.h>
 #include "chrome/browser/prefs/chrome_pref_service_factory.h"
 
 #include <stddef.h>
 
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/threading/sequenced_worker_pool.h"
@@ skipping 485 matching lines @@
 }
 
 void DisableDomainCheckForTesting() {
 #if defined(OS_WIN)
   g_disable_domain_check_for_testing = true;
 #endif  // OS_WIN
 }
 
 bool InitializePrefsFromMasterPrefs(
     const base::FilePath& profile_path,
-    const base::DictionaryValue& master_prefs) {
+    std::unique_ptr<base::DictionaryValue> master_prefs) {
   return CreateProfilePrefStoreManager(profile_path)
-      ->InitializePrefsFromMasterPrefs(master_prefs);
+      ->InitializePrefsFromMasterPrefs(std::move(master_prefs));
 }
 
 base::Time GetResetTime(Profile* profile) {
   return ProfilePrefStoreManager::GetResetTime(profile->GetPrefs());
 }
 
 void ClearResetTime(Profile* profile) {
   ProfilePrefStoreManager::ClearResetTime(profile->GetPrefs());
 }
 
 void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry) {
   ProfilePrefStoreManager::RegisterProfilePrefs(registry);
 }
 
 }  // namespace chrome_prefs