Split Dictionary's get and convert into DictionaryHelper.

Source/bindings/templates/interface.cpp

 {% extends 'interface_base.cpp' %}
 
 
 {##############################################################################}
 {% macro attribute_configuration(attribute) %}
 {% set getter_callback =
        '%sV8Internal::%sAttributeGetterCallback' %
             (cpp_class, attribute.name)
        if not attribute.constructor_type else
        ('%sV8Internal::%sConstructorGetterCallback' %
@@ skipping 787 matching lines @@
     {% if parent_interface %}{# any Event interface except Event itself #}
     if (!initialize{{parent_interface}}(eventInit, options, exceptionState, info, forEventName.isEmpty() ? String("{{interface_name}}") : forEventName))
         return false;
 
     {% endif %}
     {% for attribute in attributes
            if (attribute.is_initialized_by_event_constructor and
                not attribute.idl_type == 'any')%}
     {% set is_nullable = 'true' if attribute.is_nullable else 'false' %}
     {% if attribute.deprecate_as %}
-    if (options.convert(conversionContext.setConversionType("{{attribute.idl_type}}", {{is_nullable}}), "{{attribute.name}}", eventInit.{{attribute.cpp_name}})) {
+    if (DictionaryHelper::convert(options, conversionContext.setConversionType("{{attribute.idl_type}}", {{is_nullable}}), "{{attribute.name}}", eventInit.{{attribute.cpp_name}})) {
         if (options.hasProperty("{{attribute.name}}"))
             UseCounter::countDeprecation(callingExecutionContext(info.GetIsolate()), UseCounter::{{attribute.deprecate_as}});
     } else {
         return false;
     }
     {% else %}
-    if (!options.convert(conversionContext.setConversionType("{{attribute.idl_type}}", {{is_nullable}}), "{{attribute.name}}", eventInit.{{attribute.cpp_name}}))
+    if (!DictionaryHelper::convert(options, conversionContext.setConversionType("{{attribute.idl_type}}", {{is_nullable}}), "{{attribute.name}}", eventInit.{{attribute.cpp_name}}))
         return false;
     {% endif %}
     {% endfor %}
     return true;
 }
 
 {% endif %}
 {% endblock %}
 
 
@@ skipping 516 matching lines @@
 {% endif %}
 }
 
 template<>
 v8::Handle<v8::Value> toV8NoInline({{cpp_class}}* impl, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     return toV8(impl, creationContext, isolate);
 }
 
 {% endblock %}