title: window.requestFileSystem fails in android phonegap
body: <p>I am using window.requestFileSystem in android. But it fails with <strong>error code 9</strong>. I have read <a href="https://groups.google.com/forum/#!topic/phonegap/rgStH2USABY" rel="nofollow">here</a> the issue with android devices not having SD card. This is the code I am using</p>
  
  <pre><code>window.requestFileSystem(2, 0, function(file_system) {
                  console.log('got fs');
                  callback(null, file_system);
              }, function(err) {
                  console.log('not getting library fs'+err.code);
                  callback(err);
              });
  </code></pre>
  
  <p>How can I use this in android?</p>