Offline playback doesn't work

beaufortfrancois

Here's the error I get in DevTools: ``` ranged-response.js:50 Uncaught (in promise) TypeError: Failed to construct 'Blob': Iterator getter is not callable. at ranged-response.js:50 at <anonymous> ```

beaufortfrancois

Fixed with https://github.com/GoogleChrome/sample-media-pwa/commit/148cb080cc9fac78ce6df914d9882c35374f04d5