Create Document exitPointerLock and pointerLockElement API methods.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 938b699358cb4b1ee4462ddaf601447788c03f0d..6c29a98e53620fd8998ac9d9bc0e13e7721b9e10 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5078,7 +5078,7 @@ HTMLDialogElement* Document::activeModalDialog() const
     return toHTMLDialogElement(m_topLayerElements.last().get());
 }
 
-void Document::webkitExitPointerLock()
+void Document::exitPointerLock()
 {
     if (!page())
         return;
@@ -5089,7 +5089,7 @@ void Document::webkitExitPointerLock()
     page()->pointerLockController().requestPointerUnlock();
 }
 
-Element* Document::webkitPointerLockElement() const
+Element* Document::pointerLockElement() const
 {
     if (!page() || page()->pointerLockController().lockPending())
         return 0;