Use unique_ptr<DictionaryValue> in ProxyConfigDictionary

components/proxy_config/pref_proxy_config_tracker_impl.cc

Index: components/proxy_config/pref_proxy_config_tracker_impl.cc
diff --git a/components/proxy_config/pref_proxy_config_tracker_impl.cc b/components/proxy_config/pref_proxy_config_tracker_impl.cc
index 9c8da06904abb0db3520518b0269936b643a4e3a..f8077aa9032038126769864d3a64ebc23e3f82f1 100644
--- a/components/proxy_config/pref_proxy_config_tracker_impl.cc
+++ b/components/proxy_config/pref_proxy_config_tracker_impl.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 
+#include <memory>
 #include <utility>
 
 #include "base/bind.h"
@@ -207,8 +208,8 @@ net::ProxyConfigService::ConfigAvailability
 
 // static
 void PrefProxyConfigTrackerImpl::RegisterPrefs(PrefRegistrySimple* registry) {
-  std::unique_ptr<base::DictionaryValue> default_settings(
-      ProxyConfigDictionary::CreateSystem());
+  std::unique_ptr<base::DictionaryValue> default_settings =
+      ProxyConfigDictionary::CreateSystem();
   registry->RegisterDictionaryPref(proxy_config::prefs::kProxy,
                                    std::move(default_settings));
 }
@@ -216,8 +217,8 @@ void PrefProxyConfigTrackerImpl::RegisterPrefs(PrefRegistrySimple* registry) {
 // static
 void PrefProxyConfigTrackerImpl::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* pref_service) {
-  std::unique_ptr<base::DictionaryValue> default_settings(
-      ProxyConfigDictionary::CreateSystem());
+  std::unique_ptr<base::DictionaryValue> default_settings =
+      ProxyConfigDictionary::CreateSystem();
   pref_service->RegisterDictionaryPref(proxy_config::prefs::kProxy,
                                        std::move(default_settings));
   pref_service->RegisterBooleanPref(proxy_config::prefs::kUseSharedProxies,
@@ -239,7 +240,7 @@ ProxyPrefs::ConfigState PrefProxyConfigTrackerImpl::ReadPrefConfig(
   const base::DictionaryValue* dict =
       pref_service->GetDictionary(proxy_config::prefs::kProxy);
   DCHECK(dict);
-  ProxyConfigDictionary proxy_dict(dict);
+  ProxyConfigDictionary proxy_dict(dict->CreateDeepCopy());
 
   if (PrefConfigToNetConfig(proxy_dict, config)) {
     if (!pref->IsUserModifiable() || pref->HasUserSetting()) {