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diff --git a/Source/WebCore/bindings/js/JSDOMConstructorWithDocument.h b/Source/WebCore/bindings/js/JSDOMConstructorWithDocument.h
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+++ b/Source/WebCore/bindings/js/JSDOMConstructorWithDocument.h
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+/*
+ *  Copyright (C) 2015, 2016 Canon Inc. All rights reserved.
+ *  Copyright (C) 2016 Apple Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#pragma once
+
+#include "Document.h"
+#include "JSDOMConstructorBase.h"
+
+namespace WebCore {
+
+// Constructors using this base class depend on being in a Document and
+// can never be used from a WorkerGlobalScope.
+class JSDOMConstructorWithDocument : public JSDOMConstructorBase {
+public:
+    using Base = JSDOMConstructorBase;
+
+    Document* document() const
+    {
+        return downcast<Document>(scriptExecutionContext());
+    }
+
+protected:
+    JSDOMConstructorWithDocument(JSC::Structure* structure, JSDOMGlobalObject& globalObject)
+        : JSDOMConstructorBase(structure, globalObject)
+    {
+    }
+
+    void finishCreation(JSDOMGlobalObject& globalObject)
+    {
+        Base::finishCreation(globalObject.vm());
+        ASSERT(globalObject.scriptExecutionContext()->isDocument());
+    }
+};
+
+} // namespace WebCore