Deprecate FileError in FileAPI

LayoutTests/fast/filesystem/script-tests/filesystem-unserializable.js

 description("This tests if the filesystem object is unserializable by default");
 
 function errorCallback(error)
 {
-    testFailed("Error occurred: " + error.code);
+    testFailed("Error occurred: " + error.name);
     finishJSTest();
 }
 
 function fileSystemCallback(fs)
 {
     try {
         postMessage(fs, '*');
     } catch (e) {
         debug(e);
     }
 
     finishJSTest();
 }
 
 function onmessage()
 {
 }
 
 if (window.webkitRequestFileSystem) {
     window.addEventListener('message', onmessage, false);
     window.jsTestIsAsync = true;
     webkitRequestFileSystem(window.TEMPORARY, 100, fileSystemCallback, errorCallback);
 } else
     debug("This test requires FileSystem API support.");