Add back captureEvents and releaseEvents

LayoutTests/fast/dom/Window/get-set-properties.html

 <p>This page tests getting and setting window properties and functions.</p>
 <pre id="console"></pre>
 
 <script>
 function log(s)
 {
     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
 }
 
 function shouldBe(a, b)
@@ skipping 147 matching lines @@
     "XMLDocument", 
     "XMLHttpRequest", 
     "XMLSerializer", 
     "XPathEvaluator", 
     "XPathResult", 
     "XSLTProcessor",
     "addEventListener", 
     "alert", 
     "atob", 
     "btoa", 
+    "captureEvents",
     "clearInterval", 
     "clearTimeout",
     "clientInformation", 
     "console", 
     "devicePixelRatio", 
     "event", 
     "frames",
     "history",
     "innerHeight", 
     "innerWidth", 
@@ skipping 67 matching lines @@
     "onreset", 
     "onresize", 
     "onscroll", 
     "onsearch", 
     "onselect", 
     "onsubmit", 
     "onunload", 
     "open", 
     "print", 
     "prompt", 
+    "releaseEvents",
     "removeEventListener", 
     "resizeBy", 
     "resizeTo", 
     "scroll", 
     "scrollBy", 
     "scrollTo", 
     "setInterval", 
     "setTimeout", 
     "stop"
 ];
@@ skipping 29 matching lines @@
 
     log("\n----- tests for getting/setting functions -----\n");
 
     for (var i = 0; i < windowFunctions.length; i++) { //>
         var property = windowFunctions[i];
         shouldBeTrue("canGet('" + property + "')");
         shouldBeTrue("canSet('" + property + "')");
     }
 }
 </script>