title: Chrome app webview - clear persistent data
body: <p>I'm writing a Chrome Desktop app with a webview.
  I'd like to clear all data, including cache and cookies.</p>
  
  <p>I've found this possibly related thread, but it doesn't seem to be working:
  <a href="https://code.google.com/p/chromium/issues/detail?id=174763" rel="nofollow">https://code.google.com/p/chromium/issues/detail?id=174763</a></p>
  
  <p>Any idea?
  The best solution would be to use a webview with persistent storage, but also an in-memory solution could suffice.</p>