title: Puppeteer opens an empty tab in non-headless mode
body: <p>When running puppeteer(last version from npm - 0.13.0) and passing args to</p>
  
  <p><code>puppeteer.launch({ headless: false })</code> </p>
  
  <p>the chrome is opened with an empty page as a first tab and opens the actual page from the script in the second tab.</p>
  
  <p><code>const page = await browser.newPage();</code>
  Is it an expected behavior? Or a bug? </p>