Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/html/shadow/HTMLContentElement.h

Index: Source/core/html/shadow/HTMLContentElement.h
diff --git a/Source/core/html/shadow/HTMLContentElement.h b/Source/core/html/shadow/HTMLContentElement.h
index b3cb36aa4b652ee006d8a5eb8441a96400cd0c94..df52237d34fe7f1813653653cce7d949725e52ca 100644
--- a/Source/core/html/shadow/HTMLContentElement.h
+++ b/Source/core/html/shadow/HTMLContentElement.h
@@ -38,8 +38,8 @@ namespace WebCore {
 
 class HTMLContentElement FINAL : public InsertionPoint {
 public:
-    static PassRefPtr<HTMLContentElement> create(const QualifiedName&, Document*);
-    static PassRefPtr<HTMLContentElement> create(Document*);
+    static PassRefPtr<HTMLContentElement> create(const QualifiedName&, Document&);
+    static PassRefPtr<HTMLContentElement> create(Document&);
 
     virtual ~HTMLContentElement();
 
@@ -51,7 +51,7 @@ public:
     bool isSelectValid() const;
 
 private:
-    HTMLContentElement(const QualifiedName&, Document*);
+    HTMLContentElement(const QualifiedName&, Document&);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;