Unhide 'window.console' by renaming console variable in layout tests

LayoutTests/media/w3c-media-utils.js

-var console = null;
+var consoleDiv = null;
 function getVideoURI(baseFileName)
 {
     var fileExtension =
         (document.createElement("video").
             canPlayType('video/ogg; codecs="theora"') == "") ? "mp4" : "ogv";
     return "./content/" + baseFileName + "." + fileExtension;
 }
 
 function consoleWrite(text)
 {
-    if (!console && document.body)
+    if (!consoleDiv && document.body)
     {
-        console = document.createElement('div');
-        document.body.appendChild(console);
+        consoleDiv = document.createElement('div');
+        document.body.appendChild(consoleDiv);
     }
     var span = document.createElement("span");
     span.appendChild(document.createTextNode(text));
     span.appendChild(document.createElement('br'));
-    console.appendChild(span);
+    consoleDiv.appendChild(span);
 }
 
 function waitForEventAndRunStep(eventName, element, func, stepTest)
 {
     var eventCallback = function(event)
     {
         consoleWrite("EVENT(" + eventName + ")");
         if (func)
             func(event);
     }
     if (stepTest)
         eventCallback = stepTest.step_func(eventCallback);
 
     element.addEventListener(eventName, eventCallback, true);
 }