Have HTMLElements / SVGElements constructors take a Document reference in argument

Source/core/html/HTMLButtonElement.h

Index: Source/core/html/HTMLButtonElement.h
diff --git a/Source/core/html/HTMLButtonElement.h b/Source/core/html/HTMLButtonElement.h
index e31e41d3c35764c1f6d184be3b6c8ea27d4344d2..dbfedaabc4ef91616e18a39d9624bc26b685e651 100644
--- a/Source/core/html/HTMLButtonElement.h
+++ b/Source/core/html/HTMLButtonElement.h
@@ -30,7 +30,7 @@ namespace WebCore {
 
 class HTMLButtonElement FINAL : public HTMLFormControlElement {
 public:
-    static PassRefPtr<HTMLButtonElement> create(const QualifiedName&, Document*, HTMLFormElement*);
+    static PassRefPtr<HTMLButtonElement> create(const QualifiedName&, Document&, HTMLFormElement*);
 
     void setType(const AtomicString&);
 
@@ -39,7 +39,7 @@ public:
     virtual bool willRespondToMouseClickEvents() OVERRIDE;
 
 private:
-    HTMLButtonElement(const QualifiedName& tagName, Document*, HTMLFormElement*);
+    HTMLButtonElement(const QualifiedName& tagName, Document&, HTMLFormElement*);
 
     enum Type { SUBMIT, RESET, BUTTON };