Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/svg/SVGUnknownElement.h

Index: Source/core/svg/SVGUnknownElement.h
diff --git a/Source/core/svg/SVGUnknownElement.h b/Source/core/svg/SVGUnknownElement.h
index fe8d7e4dbe5dee0d8ab8123998113a7436b78e85..9c8518cfc60b4b73ea3aa5aef563dfa5b23aee5f 100644
--- a/Source/core/svg/SVGUnknownElement.h
+++ b/Source/core/svg/SVGUnknownElement.h
@@ -43,13 +43,13 @@ namespace WebCore {
 // false to make sure we don't attempt to render such elements.
 class SVGUnknownElement : public SVGElement {
 public:
-    static PassRefPtr<SVGUnknownElement> create(const QualifiedName& tagName, Document* document)
+    static PassRefPtr<SVGUnknownElement> create(const QualifiedName& tagName, Document& document)
     {
         return adoptRef(new SVGUnknownElement(tagName, document));
     }
 
 private:
-    SVGUnknownElement(const QualifiedName&, Document*);
+    SVGUnknownElement(const QualifiedName&, Document&);
 
     virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE { return false; }
 };