puppeteer: Blob URLs broken on Chrome 71 in headless mode

Steps to reproduce

Tell us about your environment:

• Puppeteer version: 1.9.0
• Platform / OS version: Ubuntu x64
• Node.js version: v10.12.0
• Chrome version: 71.0.3578.20 (beta)

What steps will reproduce the problem?

The smallest example I was able to make:

    await page.evaluate(() => {
      const url = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg=='

      return window.fetch(url)
        .then(res => res.blob())
        .then(blob => URL.createObjectURL(blob))
        .then(url => window.fetch(url)) // crashes here
        .then(res => res.blob())
    })

What is the expected result? On Chrome 70 or Chrome 71 headfull it works fine

What happens instead? On Chrome 71 in headless mode I get: Failed to load resource: net::ERR_UNKNOWN_URL_SCHEME