Create Document exitPointerLock and pointerLockElement API methods.

LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html

Index: LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html
diff --git a/LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html b/LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html
index d82db940cd3e8f4caa075e2c4c702c402021638d..df7e2eb984890be10b45849fbc254905c8f9f91a 100644
--- a/LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html
+++ b/LayoutTests/pointer-lock/pointerlockelement-null-when-pending.html
@@ -16,26 +16,26 @@
 
     todo = [
         function () {
-            shouldBe("document.webkitPointerLockElement", "null");
+            shouldBe("document.pointerLockElement", "null");
             testRunner.setPointerLockWillRespondAsynchronously();
             expectOnlyChangeEvent("Lock.");
             targetDiv1.requestPointerLock();
             doNextStep();
         },
         function () {
-            shouldBe("document.webkitPointerLockElement", "null");
+            shouldBe("document.pointerLockElement", "null");
             testRunner.didAcquirePointerLock();
             // doNextStep called from event handler set with expect...
         },
         function () {
-            shouldBe("document.webkitPointerLockElement", "targetDiv1");
+            shouldBe("document.pointerLockElement", "targetDiv1");
             expectOnlyChangeEvent("Unlock.");
-            document.webkitExitPointerLock();
-            shouldBe("document.webkitPointerLockElement", "targetDiv1");
+            document.exitPointerLock();
+            shouldBe("document.pointerLockElement", "targetDiv1");
             // doNextStep called from event handler set with expect...
         },
         function () {
-            shouldBe("document.webkitPointerLockElement", "null");
+            shouldBe("document.pointerLockElement", "null");
             doNextStep();
         },
     ];