Revert of Remove prefixed Pointer Lock API.

LayoutTests/pointer-lock/pointerlockelement-null-when-pending-prefixed-expected.txt

Index: LayoutTests/pointer-lock/pointerlockelement-null-when-pending-prefixed-expected.txt
diff --git a/LayoutTests/pointer-lock/pointerlockelement-null-when-pending-prefixed-expected.txt b/LayoutTests/pointer-lock/pointerlockelement-null-when-pending-prefixed-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3cfbbfc76f35a04f7cabca4407926a194f006d22
--- /dev/null
+++ b/LayoutTests/pointer-lock/pointerlockelement-null-when-pending-prefixed-expected.txt
@@ -0,0 +1,18 @@
+Test pointerLockElement is null when a lock is pending.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS document.webkitPointerLockElement is null
+     Lock.
+PASS document.webkitPointerLockElement is null
+PASS onwebkitpointerlockchange received after: Lock.
+PASS document.webkitPointerLockElement is targetDiv1
+     Unlock.
+PASS document.webkitPointerLockElement is targetDiv1
+PASS onwebkitpointerlockchange received after: Unlock.
+PASS document.webkitPointerLockElement is null
+PASS successfullyParsed is true
+
+TEST COMPLETE
+