Implement the unprefixed the Fullscreen API

Source/core/dom/DocumentFullscreen.cpp

 /*
  * Copyright (C) 2013, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 12 matching lines @@
  * DAMAGE.
  */
 
 #include "config.h"
 #include "core/dom/DocumentFullscreen.h"
 
 #include "core/dom/FullscreenElementStack.h"
 
 namespace blink {
 
+bool DocumentFullscreen::fullscreenEnabled(Document& document)
+{
+    return FullscreenElementStack::fullscreenEnabled(document);
+}
+
+Element* DocumentFullscreen::fullscreenElement(Document& document)
+{
+    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document))
+        return fullscreen->fullscreenElement();
+    return 0;
+}
+
+void DocumentFullscreen::exitFullscreen(Document& document)
+{
+    FullscreenElementStack::from(document).exitFullscreen();
+}
+
 bool DocumentFullscreen::webkitIsFullScreen(Document& document)
 {
     if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document))
         return fullscreen->webkitIsFullScreen();
     return false;
 }
 
 bool DocumentFullscreen::webkitFullScreenKeyboardInputAllowed(Document& document)
 {
     if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document))
         return fullscreen->webkitFullScreenKeyboardInputAllowed();
     return false;
 }
 
 Element* DocumentFullscreen::webkitCurrentFullScreenElement(Document& document)
 {
     if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document))
         return fullscreen->webkitCurrentFullScreenElement();
     return 0;
 }
 
-bool DocumentFullscreen::webkitFullscreenEnabled(Document& document)
-{
-    return FullscreenElementStack::fullscreenEnabled(document);
-}
-
-Element* DocumentFullscreen::webkitFullscreenElement(Document& document)
-{
-    if (FullscreenElementStack* fullscreen = FullscreenElementStack::fromIfExists(document))
-        return fullscreen->fullscreenElement();
-    return 0;
-}
-
-void DocumentFullscreen::webkitExitFullscreen(Document& document)
-{
-    FullscreenElementStack::from(document).exitFullscreen();
-}
-
 } // namespace blink