Implement the unprefixed the Fullscreen API

Source/core/dom/DocumentFullscreen.h

Index: Source/core/dom/DocumentFullscreen.h
diff --git a/Source/core/dom/DocumentFullscreen.h b/Source/core/dom/DocumentFullscreen.h
index 01a5ac96cf68b2be884aac7d65f691e6d655e7b6..0ddd97ad995fff34982e9d56b2feaee978b2eb6e 100644
--- a/Source/core/dom/DocumentFullscreen.h
+++ b/Source/core/dom/DocumentFullscreen.h
@@ -26,6 +26,8 @@
 #ifndef DocumentFullscreen_h
 #define DocumentFullscreen_h
 
+#include "core/events/EventTarget.h"
+
 namespace WebCore {
 
 class Document;
@@ -33,14 +35,18 @@ class Element;
 
 class DocumentFullscreen {
 public:
+    static bool fullscreenEnabled(Document&);
+    static Element* fullscreenElement(Document&);
+    static void exitFullscreen(Document&);
+
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(fullscreenchange);
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(fullscreenerror);
+
+    // Mozilla version
     static bool webkitIsFullScreen(Document&);
     static bool webkitFullScreenKeyboardInputAllowed(Document&);
     static Element* webkitCurrentFullScreenElement(Document&);
     static void webkitCancelFullScreen(Document&);
-
-    static bool webkitFullscreenEnabled(Document&);
-    static Element* webkitFullscreenElement(Document&);
-    static void webkitExitFullscreen(Document&);
 };
 
 } // namespace WebCore