Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/svg/SVGLinearGradientElement.h

Index: Source/core/svg/SVGLinearGradientElement.h
diff --git a/Source/core/svg/SVGLinearGradientElement.h b/Source/core/svg/SVGLinearGradientElement.h
index c80d6ffeac59b04d0eb1e10959e3828a4021ab5f..7f5f5ebe6ab23266d142b90fcb2332cddd881599 100644
--- a/Source/core/svg/SVGLinearGradientElement.h
+++ b/Source/core/svg/SVGLinearGradientElement.h
@@ -31,12 +31,12 @@ struct LinearGradientAttributes;
 
 class SVGLinearGradientElement FINAL : public SVGGradientElement {
 public:
-    static PassRefPtr<SVGLinearGradientElement> create(const QualifiedName&, Document*);
+    static PassRefPtr<SVGLinearGradientElement> create(const QualifiedName&, Document&);
 
     bool collectGradientAttributes(LinearGradientAttributes&);
 
 private:
-    SVGLinearGradientElement(const QualifiedName&, Document*);
+    SVGLinearGradientElement(const QualifiedName&, Document&);
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;