Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/svg/SVGRadialGradientElement.h

Index: Source/core/svg/SVGRadialGradientElement.h
diff --git a/Source/core/svg/SVGRadialGradientElement.h b/Source/core/svg/SVGRadialGradientElement.h
index 20be5647b6dafd01460481edea69f237dad68f5a..4b7c376a3ac6a2f9c7572631588d4a308800c774 100644
--- a/Source/core/svg/SVGRadialGradientElement.h
+++ b/Source/core/svg/SVGRadialGradientElement.h
@@ -31,12 +31,12 @@ struct RadialGradientAttributes;
 
 class SVGRadialGradientElement FINAL : public SVGGradientElement {
 public:
-    static PassRefPtr<SVGRadialGradientElement> create(const QualifiedName&, Document*);
+    static PassRefPtr<SVGRadialGradientElement> create(const QualifiedName&, Document&);
 
     bool collectGradientAttributes(RadialGradientAttributes&);
 
 private:
-    SVGRadialGradientElement(const QualifiedName&, Document*);
+    SVGRadialGradientElement(const QualifiedName&, Document&);
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;