Make proxy settings one atomic dictionary in the PrefStores such that modifications are atomic.

chrome/browser/prefs/pref_service.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/prefs/pref_service.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 222 matching lines @@
 
 void PrefService::RegisterFilePathPref(const char* path,
                                        const FilePath& default_value) {
   RegisterPreference(path, Value::CreateStringValue(default_value.value()));
 }
 
 void PrefService::RegisterListPref(const char* path) {
   RegisterPreference(path, new ListValue());
 }
 
+void PrefService::RegisterListPref(const char* path, ListValue* default_value) {
+  RegisterPreference(path, default_value);
+}
+
 void PrefService::RegisterDictionaryPref(const char* path) {
   RegisterPreference(path, new DictionaryValue());
 }
 
+void PrefService::RegisterDictionaryPref(const char* path,
+                                         DictionaryValue* default_value) {
+  RegisterPreference(path, default_value);
+}
+
 void PrefService::RegisterLocalizedBooleanPref(const char* path,
                                                int locale_default_message_id) {
   RegisterPreference(
       path,
       CreateLocaleDefaultValue(Value::TYPE_BOOLEAN, locale_default_message_id));
 }
 
 void PrefService::RegisterLocalizedIntegerPref(const char* path,
                                                int locale_default_message_id) {
   RegisterPreference(
@@ skipping 402 matching lines @@
 
 bool PrefService::Preference::IsDefaultValue() const {
   return pref_service_->pref_value_store_->
       PrefValueFromDefaultStore(name_.c_str());
 }
 
 bool PrefService::Preference::IsUserModifiable() const {
   return pref_service_->pref_value_store_->
       PrefValueUserModifiable(name_.c_str());
 }