Simplify full-screen-test.js's runWithKeyDown()

LayoutTests/fullscreen/full-screen-test.js

 var console = null;
 var printFullTestDetails = true; // This is optionaly switched of by test whose tested values can differ. (see disableFullTestDetailsPrinting())
 
 logConsole();
 
 if (window.testRunner) {
     if (window.runPixelTests)
         testRunner.dumpAsTextWithPixelResults();
     else
         testRunner.dumpAsText();
     testRunner.waitUntilDone();
 }
 
 function runWithKeyDown(fn) 
 {
-    // FIXME: WKTR does not yet support the keyDown() message.  Do a mouseDown here
-    // instead until keyDown support is added.
-    var eventName = !window.testRunner || eventSender.keyDown ? 'keypress' : 'mousedown'
-
     function thunk() {
-        document.removeEventListener(eventName, thunk, false);
+        document.removeEventListener("keypress", thunk, false);
         fn();
     }
-    document.addEventListener(eventName, thunk, false);
+    document.addEventListener("keypress", thunk, false);
 
-    if (window.testRunner) {
-        if (eventSender.keyDown)
-            eventSender.keyDown(" ", []);
-        else
-            eventSender.mouseDown();
-    }
+    if (window.eventSender)
+        eventSender.keyDown(" ", []);
 }
 
 function logConsole()
 {
     if (!console && document.body) {
         console = document.createElement('div');
         document.body.appendChild(console);
     }
     return console;
 }
@@ skipping 116 matching lines @@
     else
         consoleWrite(text + " <span style='color:red'>FAIL</span>");
 }
 
 function consoleWrite(text)
 {
     if (testEnded)
         return;
     logConsole().innerHTML += text + "<br>";
 }