Oilpan: add [WillBeGarbageCollected] for Element.

Source/bindings/templates/interface.cpp

Index: Source/bindings/templates/interface.cpp
diff --git a/Source/bindings/templates/interface.cpp b/Source/bindings/templates/interface.cpp
index 963889331b4bbe72f08f8d8d769ade465ad15f37..7078e454decd8f034d5359708d056b968aef5bfb 100644
--- a/Source/bindings/templates/interface.cpp
+++ b/Source/bindings/templates/interface.cpp
@@ -562,7 +562,7 @@ static void {{cpp_class}}OriginSafeMethodSetterCallback(v8::Local<v8::String> na
                               if is_active_dom_object else '0' %}
 {% set to_event_target = '%s::toEventTarget' % v8_class
                          if is_event_target else '0' %}
-const WrapperTypeInfo {{v8_class}}Constructor::wrapperTypeInfo = { gin::kEmbedderBlink, {{v8_class}}Constructor::domTemplate, {{v8_class}}::derefObject, {{to_active_dom_object}}, {{to_event_target}}, 0, {{v8_class}}::installPerContextEnabledMethods, 0, WrapperTypeObjectPrototype, RefCountedObject };
+const WrapperTypeInfo {{v8_class}}Constructor::wrapperTypeInfo = { gin::kEmbedderBlink, {{v8_class}}Constructor::domTemplate, {{v8_class}}::derefObject, {{to_active_dom_object}}, {{to_event_target}}, 0, {{v8_class}}::installPerContextEnabledMethods, 0, WrapperTypeObjectPrototype, {{gc_type}} };
 
 {{named_constructor_callback(named_constructor)}}
 v8::Handle<v8::FunctionTemplate> {{v8_class}}Constructor::domTemplate(v8::Isolate* isolate)