title: How to force chrome display a Save As Dialog when i click a download link?
body: <p>I'm using WebKitBlobBuilder in chrome to generate a text file in user side.</p>
  
  <p>Now, i need to show a save as dialog, let user decide which folder to put the newly generated file.(In chrome)</p>
  
  <p>"Save As Dialog", no browser configurations.</p>
  
  <p>How? Thanks!</p>