Revert of Revert of Remove prefixed Pointer Lock API.

Source/core/dom/Element.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Peter Kelly (pmk@post.com)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012, 2013 Apple Inc. All rights reserved.
  *           (C) 2007 Eric Seidel (eric@webkit.org)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 2716 matching lines @@
 {
     if (isInTopLayer() == inTopLayer)
         return;
     setElementFlag(IsInTopLayer, inTopLayer);
 
     // We must ensure a reattach occurs so the renderer is inserted in the correct sibling order under RenderView according to its
     // top layer position, or in its usual place if not in the top layer.
     lazyReattachIfAttached();
 }
 
-void Element::webkitRequestPointerLock()
-{
-    if (document().page())
-        document().page()->pointerLockController().requestPointerLock(this);
-}
-
 void Element::requestPointerLock()
 {
     if (document().page())
         document().page()->pointerLockController().requestPointerLock(this);
 }
 
 SpellcheckAttributeState Element::spellcheckAttributeState() const
 {
     const AtomicString& value = fastGetAttribute(spellcheckAttr);
     if (value == nullAtom)
@@ skipping 581 matching lines @@
 {
 #if ENABLE(OILPAN)
     if (hasRareData())
         visitor->trace(elementRareData());
     visitor->trace(m_elementData);
 #endif
     ContainerNode::trace(visitor);
 }
 
 } // namespace blink