An [ActiveDOMObject] IDL attribute should be inherited
https://bugs.webkit.org/show_bug.cgi?id=107877

Reviewed by Adam Barth.

Now we support IDL attribute inheritance. We can remove
[ActiveDOMObject] from subclasses.

No tests. No change in behavior.

* Modules/indexeddb/IDBOpenDBRequest.idl:
* Modules/webaudio/OfflineAudioContext.idl:
* bindings/scripts/CodeGeneratorJS.pm:
(GenerateHeader):
(GenerateImplementation):
* bindings/scripts/CodeGeneratorV8.pm:
(GenerateHeader):
(GenerateNamedConstructorCallback):
(GenerateImplementation):
* workers/SharedWorker.idl:
* workers/Worker.idl:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@140938 268f45cc-cd09-0410-ab3c-d52691b4dbfc