Don't use deprecated ListValue::Append(Value*) overload.

net/log/net_log.cc

Index: net/log/net_log.cc
diff --git a/net/log/net_log.cc b/net/log/net_log.cc
index 484abec07787353cc0eb1b6de67ad8f32d71e90f..b038519651a229f369f5b64febb9430f1964bcda 100644
--- a/net/log/net_log.cc
+++ b/net/log/net_log.cc
@@ -152,7 +152,7 @@ bool NetLog::Source::FromEventParameters(base::Value* event_params,
   return true;
 }
 
-base::Value* NetLog::Entry::ToValue() const {
+std::unique_ptr<base::Value> NetLog::Entry::ToValue() const {
   std::unique_ptr<base::DictionaryValue> entry_dict(
       new base::DictionaryValue());
 
@@ -177,7 +177,7 @@ base::Value* NetLog::Entry::ToValue() const {
       entry_dict->Set("params", std::move(value));
   }
 
-  return entry_dict.release();
+  return std::move(entry_dict);
 }
 
 std::unique_ptr<base::Value> NetLog::Entry::ParametersToValue() const {