Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //ipc

ipc/ipc_message_utils_unittest.cc

Index: ipc/ipc_message_utils_unittest.cc
diff --git a/ipc/ipc_message_utils_unittest.cc b/ipc/ipc_message_utils_unittest.cc
index 51e8336a010d4dd1a01df3dbe42107d7e538cfc0..977c9e0606f4f1cba59394f3fad522b9242612f4 100644
--- a/ipc/ipc_message_utils_unittest.cc
+++ b/ipc/ipc_message_utils_unittest.cc
@@ -105,8 +105,8 @@ TEST(IPCMessageUtilsTest, ValueSize) {
   value->SetWithoutPathExpansion("nested", std::move(nested_dict));
 
   std::unique_ptr<base::ListValue> list_value(new base::ListValue);
-  list_value->Append(new base::StringValue("im a string"));
-  list_value->Append(new base::StringValue("im another string"));
+  list_value->AppendString("im a string");
+  list_value->AppendString("im another string");
   value->SetWithoutPathExpansion("awesome-list", std::move(list_value));
 
   base::Pickle pickle;