Removed fullscreen test timeouts to prevent flakiness.

LayoutTests/fullscreen/full-screen-iframe-legacy.html

 <p>Test for <a href="https://bugs.webkit.org/show_bug.cgi?id=61461">bug 61461</a>: 
 Handle entering full screen security restrictions</p>
 <p>To test manually, click the video "full screen" button - the page should enter full screen mode.</p>
 <script src="full-screen-test.js"></script>
 <script src="../media/media-file.js"></script>
 <script>
 
 function canplaythrough() {
     var frame = document.getElementById('frame');
 
     runWithKeyDown(function() {
-        setTimeout(function() { 
-            consoleWrite("FAIL - did not enter full screen!"); 
-            endTest(); 
-        }, 100);
-
         var video = frame.contentDocument.getElementsByTagName('video')[0];
         video.webkitEnterFullScreen();
     });
 }
 
 function runTest() {
     var frame = document.getElementById('frame');
 
     waitForEvent(frame.contentDocument, 'webkitfullscreenchange', function() { 
             test("document.getElementById('frame').contentDocument.width==document.width")
             endTest();
     });
 
     var video = frame.contentDocument.getElementsByTagName('video')[0];
     var mediaFile = findMediaFile("video", "../../media/content/test");
     video.src = mediaFile;
     video.addEventListener('canplaythrough', canplaythrough);
 }
 </script>
 <iframe id="frame" src="resources/legacy.html" onload="runTest()" width="336" height="256">
 </iframe>