title: HTML5 fileWriter.write doesn't write to local file
body: <p>I am working on the tutorial for HTML5 FileSystem-API.
  Basically I would like to write a file to my machine. I am using python's simpleHTTPServer to serve the website. Once I load the webpage, the console doesn't raise an error and I get a message that the write was successful. But I can't find the file anywhere on my machine. Here is my code:</p>
  
  <pre><code>function onInitFs(fs) {
  
    fs.root.getFile('zz11zzlog.txt', {create: true}, function(fileEntry) {
  
      // Create a FileWriter object for our FileEntry (log.txt).
      fileEntry.createWriter(function(fileWriter) {
  
        fileWriter.onwriteend = function(e) {
          console.log('Write completed.');
        };
  
        fileWriter.onerror = function(e) {
          console.log('Write failed: ' + e.toString());
        };
  
        // Create a new Blob and write it to log.txt.
        var blob = new Blob(['Lorem Ipsum'], {type: 'text/plain'});
  
        fileWriter.write(blob);
  
      }, errorHandler);
  
    }, errorHandler);
  
  }
  
  function errorHandler(e) {
    var msg = '';
  
    switch (e.code) {
      case FileError.QUOTA_EXCEEDED_ERR:
        msg = 'QUOTA_EXCEEDED_ERR';
        break;
      case FileError.NOT_FOUND_ERR:
        msg = 'NOT_FOUND_ERR';
        break;
      case FileError.SECURITY_ERR:
        msg = 'SECURITY_ERR';
        break;
      case FileError.INVALID_MODIFICATION_ERR:
        msg = 'INVALID_MODIFICATION_ERR';
        break;
      case FileError.INVALID_STATE_ERR:
        msg = 'INVALID_STATE_ERR';
        break;
      default:
        msg = 'Unknown Error';
        break;
    };
  
    console.log('Error: ' + msg);
  }
  window.webkitRequestFileSystem(window.TEMPORARY, 1024*1024, onInitFs, errorHandler);
  </code></pre>