UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36

Steps to reproduce the problem:
The latest puppeteer v1.2.0 uses Chromium 67.0.3372.0 (r543305):

https://github.com/GoogleChrome/puppeteer/releases/tag/v1.2.0

I find that this version of Chromium breaks my service worker caching.

When using the same cache folder between page loads (by passing the same `userDataDir`), loading the following node server page the first time should say "fetched from network" and then on reloading twice (when stuff is fully cached in service worker), it should change to "retrieved from service worker cache".

You can see this behaviour in a normal chrome browser by loading the URL used below (https://cloud3squared.com/files/sw-chromium-bug/index.html) and then hitting F5 a few times.

When screenshotting this page with puppeteer/chrome, it has been working exactly as explained above... but now when I try the chromium version that is shipping with puppeteer 1.2.0, it is no longer working... however many reloads still shows "fetched from network"... and the cache quota info also displayed on the page shows as zero.

node.js code:

#!/bin/env node

const express = require('express');
const puppeteer = require('puppeteer');
const path = require('path');

const app = express();

const test = async function (req, res, next) {

    // this demo works works when using the following version ...
    //    const browserVersion = '539001'; // 66.0.3355.0

    // but NOT with the version shipped with puppeteer 1.2.0 ...
    const browserVersion = '543305'; // 67.0.3372.0

    const browserFetcher = puppeteer.createBrowserFetcher();
    const revisionInfo = await browserFetcher.download(browserVersion);
    const userDataDir = path.join(__dirname, '.puppeteer-user-data-dir');
    const launchOptions = { userDataDir: userDataDir, executablePath: revisionInfo.executablePath };
    const browser = await puppeteer.launch(launchOptions);
    const page = await browser.newPage();
    await page.goto('https://cloud3squared.com/files/sw-chromium-bug/index.html', { waitUntil: 'networkidle0' });
    const screenshotBuffer = await page.screenshot();
    await browser.close();
    res.header('Content-Type', 'image/png');
    res.send(screenshotBuffer);
};

app.get('/test', test);

app.listen(process.env.PORT || 8080, process.env.IP, function () {
    console.log('node server started at', new Date());
});

What is the expected behavior?
See above

What went wrong?
See above

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 67.0.3372.0 (543305)  Channel: n/a
OS Version: 
Flash Version: 

I also reported this over at puppeteer but got no response:

https://github.com/GoogleChrome/puppeteer/issues/2212