AbstractModule should accept a PassRefPtr

sky/engine/core/app/AbstractModule.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SKY_ENGINE_CORE_APP_ABSTRACT_MODULE_H_
 #define SKY_ENGINE_CORE_APP_ABSTRACT_MODULE_H_
 
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/events/EventTarget.h"
 #include "wtf/RefCounted.h"
 
 namespace blink {
 
 class AbstractModule : public RefCounted<AbstractModule>,
                        public EventTargetWithInlineData,
                        public ContextLifecycleObserver {
   DEFINE_WRAPPERTYPEINFO();
   REFCOUNTED_EVENT_TARGET(AbstractModule);
  public:
   virtual ~AbstractModule();
 
   Document* document() const { return document_.get(); }
   const String& url() const { return url_; }
 
  protected:
-  AbstractModule(ExecutionContext*, Document*, const String& url);
+  AbstractModule(ExecutionContext*, PassRefPtr<Document>, const String& url);
 
  private:
   ExecutionContext* executionContext() const override;
 
   RefPtr<Document> document_;
   String url_;
 };
 
 } // namespace blink
 
 #endif // SKY_ENGINE_CORE_APP_ABSTRACT_MODULE_H_