Revert of Remove prefixed Pointer Lock API.

LayoutTests/pointer-lock/lock-already-locked-prefixed-expected.txt

Index: LayoutTests/pointer-lock/lock-already-locked-prefixed-expected.txt
diff --git a/LayoutTests/pointer-lock/lock-already-locked-prefixed-expected.txt b/LayoutTests/pointer-lock/lock-already-locked-prefixed-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..477be5315804fbee84cd055ba9fa06102e6259c4
--- /dev/null
+++ b/LayoutTests/pointer-lock/lock-already-locked-prefixed-expected.txt
@@ -0,0 +1,19 @@
+Test calling lock when already in a locked state.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS document.webkitPointerLockElement is null
+     Locking targetdiv1.
+PASS document.onwebkitpointerlockchange event received.
+PASS document.webkitPointerLockElement is targetdiv1
+     Locking targetdiv1, again.
+PASS document.onwebkitpointerlockchange event received.
+PASS document.webkitPointerLockElement is targetdiv1
+     Locking targetdiv2.
+PASS document.onwebkitpointerlockchange event received.
+PASS document.webkitPointerLockElement is targetdiv2
+PASS successfullyParsed is true
+
+TEST COMPLETE
+