Have Node::document() return a reference instead of a pointer

Source/core/html/HTMLVideoElement.cpp

Index: Source/core/html/HTMLVideoElement.cpp
diff --git a/Source/core/html/HTMLVideoElement.cpp b/Source/core/html/HTMLVideoElement.cpp
index a5590d2d2b147182594b29a148bce9f0c4724d20..8e6cd853a06b79276fe89e45ae16c31f93fe3505 100644
--- a/Source/core/html/HTMLVideoElement.cpp
+++ b/Source/core/html/HTMLVideoElement.cpp
@@ -120,7 +120,7 @@ void HTMLVideoElement::parseAttribute(const QualifiedName& name, const AtomicStr
 
 bool HTMLVideoElement::supportsFullscreen() const
 {
-    Page* page = document() ? document()->page() : 0;
+    Page* page = &document() ? document().page() : 0;
     if (!page)
         return false;
 
@@ -279,7 +279,7 @@ KURL HTMLVideoElement::posterImageURL() const
     String url = stripLeadingAndTrailingHTMLSpaces(imageSourceURL());
     if (url.isEmpty())
         return KURL();
-    return document()->completeURL(url);
+    return document().completeURL(url);
 }
 
 }