Move PrefRegistrySimple to use unique_ptr<Value>

components/cronet/android/cronet_url_request_context_adapter.cc

Index: components/cronet/android/cronet_url_request_context_adapter.cc
diff --git a/components/cronet/android/cronet_url_request_context_adapter.cc b/components/cronet/android/cronet_url_request_context_adapter.cc
index f195c0447bba811d74dfb0e15cde530b267456b5..2a607bfb6c38a7a082717880a71e1dfbd558e0a9 100644
--- a/components/cronet/android/cronet_url_request_context_adapter.cc
+++ b/components/cronet/android/cronet_url_request_context_adapter.cc
@@ -669,7 +669,7 @@ void CronetURLRequestContextAdapter::InitializeOnNetworkThread(
     factory.set_user_prefs(json_pref_store_);
     scoped_refptr<PrefRegistrySimple> registry(new PrefRegistrySimple());
     registry->RegisterDictionaryPref(kHttpServerProperties,
-                                     new base::DictionaryValue());
+                                     base::MakeUnique<base::DictionaryValue>());
     if (config->enable_network_quality_estimator) {
       // Use lossy prefs to limit the overhead of reading/writing the prefs.
       registry->RegisterDictionaryPref(kNetworkQualities,