IDL compiler: [CustomLegacyCall] interfaces, cleanup header conditional spacing

Source/bindings/templates/interface.cpp

 {% extends 'interface_base.cpp' %}
 
 
 {##############################################################################}
 {% macro attribute_configuration(attribute) %}
 {% set getter_callback_name =
        '%sV8Internal::%sAttributeGetterCallback' %
             (interface_name, attribute.name)
        if not attribute.constructor_type else
        '{0}V8Internal::{0}ConstructorGetter'.format(interface_name) %}
@@ skipping 212 matching lines @@
     {% endif %}{# install_custom_signature #}
     {% endfor %}
     {% for attribute in attributes if attribute.is_static %}
     {% set getter_callback_name = '%sV8Internal::%sAttributeGetterCallback' %
            (interface_name, attribute.name) %}
     functionTemplate->SetNativeDataProperty(v8::String::NewSymbol("{{attribute.name}}"), {{getter_callback_name}}, {{attribute.setter_callback_name}}, v8::External::New(isolate, 0), static_cast<v8::PropertyAttribute>(v8::None), v8::Handle<v8::AccessorSignature>(), static_cast<v8::AccessControl>(v8::DEFAULT));
     {% endfor %}
     {% if constants %}
     {{install_constants() | indent}}
     {% endif %}
+    {% if has_custom_legacy_call %}
+    functionTemplate->InstanceTemplate()->SetCallAsFunctionHandler({{v8_class_name}}::legacyCallCustom);
+    {% endif %}
 
     // Custom toString template
     functionTemplate->Set(v8::String::NewSymbol("toString"), V8PerIsolateData::current()->toStringTemplate());
     return functionTemplate;
 }
 
 {% endblock %}
 
 
 {######################################}
@@ skipping 149 matching lines @@
     V8DOMWrapper::associateObjectWithWrapper<{{v8_class_name}}>(impl, &wrapperTypeInfo, wrapper, isolate, {{wrapper_configuration}});
     return wrapper;
 }
 
 void {{v8_class_name}}::derefObject(void* object)
 {
     fromInternalPointer(object)->deref();
 }
 
 {% endblock %}