Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/html/HTMLModElement.h

Index: Source/core/html/HTMLModElement.h
diff --git a/Source/core/html/HTMLModElement.h b/Source/core/html/HTMLModElement.h
index 158a9c302b7987fba103af4d8782ce7ce3f2cb94..7fcc7c93edf645c4daf1319ae2f671f08ab197b7 100644
--- a/Source/core/html/HTMLModElement.h
+++ b/Source/core/html/HTMLModElement.h
@@ -30,10 +30,10 @@ namespace WebCore {
 
 class HTMLModElement FINAL : public HTMLElement {
 public:
-    static PassRefPtr<HTMLModElement> create(const QualifiedName&, Document*);
+    static PassRefPtr<HTMLModElement> create(const QualifiedName&, Document&);
 
 private:
-    HTMLModElement(const QualifiedName&, Document*);
+    HTMLModElement(const QualifiedName&, Document&);
 
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 };