Create Document exitPointerLock and pointerLockElement API methods.

LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html

Index: LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html
diff --git a/LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html b/LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html
index 547c97438eedd8e93290e66f19eacb7b3fdfd73d..63c258788b104363b4efe5460385d7af7571fa4b 100644
--- a/LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html
+++ b/LayoutTests/http/tests/pointer-lock/pointerlockelement-different-origin.html
@@ -10,7 +10,7 @@
   <iframe src="http://localhost:8080/resources/pointer-lock/inner-iframe.html" onload="doNextStepWithUserGesture()"></iframe>
 </div>
 <script>
-    description("Test iframe from different origin can not access webkitPointerLockElement.")
+    description("Test iframe from different origin can not access pointerLockElement.")
     window.jsTestIsAsync = true;
 
     targetDiv1 = document.getElementById("target1");
@@ -19,18 +19,18 @@
     todo = [
       function () {
           expectOnlyChangeEvent("Lock targetDiv1.");
-          targetDiv1.webkitRequestPointerLock();
+          targetDiv1.requestPointerLock();
           // doNextStep called by event handler.
       },
       function () {
-          shouldBe("document.webkitPointerLockElement", "targetDiv1");
+          shouldBe("document.pointerLockElement", "targetDiv1");
           doNextStep();
       },
       function () {
-          iframe.contentWindow.postMessage(["eval", 'parent.postMessage(thisFileName() + " document.webkitPointerLockElement = " + document.webkitPointerLockElement, "*")'], "*");
+          iframe.contentWindow.postMessage(["eval", 'parent.postMessage(thisFileName() + " document.pointerLockElement = " + document.pointerLockElement, "*")'], "*");
           window.onmessage = function (messageEvent) {
               message = messageEvent.data;
-              shouldBeEqualToString("message", "inner-iframe.html document.webkitPointerLockElement = null");
+              shouldBeEqualToString("message", "inner-iframe.html document.pointerLockElement = null");
               window.onmessage = null;
               doNextStep();
           }