Removed fullscreen test timeouts to prevent flakiness.

LayoutTests/fullscreen/full-screen-iframe-allowed-prefixed.html

 <p>Test for <a href="http://bugs.webkit.org/show_bug.cgi?id=56264">bug 56264</a>: 
 Handle entering full screen security restrictions</p>
 <p>To test manually, click the "Go full screen" button - the page should enter full screen mode.</p>
 <script src="full-screen-test.js"></script>
 <script>
 function runTest() {
     var frame = document.getElementById('frame');
 
     waitForEvent(frame.contentDocument, 'webkitfullscreenchange', function() { 
             test("document.getElementById('frame').contentDocument.width==document.width")
             endTest();
     });
 
     runWithKeyDown(function() {
-
-        setTimeout(function() { 
-            consoleWrite("FAIL - did not enter full screen!"); 
-            endTest(); 
-        }, 50);
-
         frame.contentDocument.documentElement.webkitRequestFullScreen();
     });
 }
 </script>
 <iframe id="frame" src="resources/inner.html" width="300" height="100" onload="runTest()" webkitallowfullscreen>
 </iframe>