IDL: Drop value conversion (V8 -> C++) macros from generated code

Source/bindings/tests/results/core/V8TestSpecialOperations.cpp

Index: Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
diff --git a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
index ea4cbb766dd8e0fcdf51e17dfd2e28a6a45095dc..2482aed8628888fb7cb9d01fa3f9e1b7794ab660 100644
--- a/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
+++ b/Source/bindings/tests/results/core/V8TestSpecialOperations.cpp
@@ -45,7 +45,7 @@ static void namedItemMethod(const v8::FunctionCallbackInfo<v8::Value>& info)
     TestSpecialOperations* impl = V8TestSpecialOperations::toImpl(info.Holder());
     V8StringResource<> name;
     {
-        TOSTRING_VOID_INTERNAL(name, info[0]);
+        TONATIVE_CONVERT((name = info[0]).prepare(), return);
     }
     NodeOrNodeList result;
     impl->getItem(name, result);