IDL: Use ALLOW_ONLY_INLINE_ALLOCATION() in dictionaries

Source/bindings/templates/methods.cpp

Index: Source/bindings/templates/methods.cpp
diff --git a/Source/bindings/templates/methods.cpp b/Source/bindings/templates/methods.cpp
index c2d2e70a1dffe18aaddec76ae2d5b56428c20f57..78a1b0f1bedc2b7a7277e833dfea65d98b837add 100644
--- a/Source/bindings/templates/methods.cpp
+++ b/Source/bindings/templates/methods.cpp
@@ -233,6 +233,9 @@ Document& document = *toDocument(currentExecutionContext(info.GetIsolate()));
 {{method.cpp_type}} result{{method.cpp_type_initializer}};
 if (!{{method.cpp_value}})
     return;
+{% elif method.use_output_parameter_for_result %}
+{{method.cpp_type}} result;
+{{cpp_value}};
 {% elif method.is_constructor %}
 {{method.cpp_type}} impl = {{cpp_value}};
 {% elif method.use_local_result and not method.union_arguments %}