Chrome headless doesn't work on Azure Functions on Linux

#### Investigative information

Please provide the following:

- Timestamp: 2019-09-04
- Function App version (1.0 or 2.0): 2.0

#### Repro steps

1. Add this code to you function (in my case, type httpTrigger)

```
const puppeteer = require('puppeteer');
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto('https://example.com');
await page.screenshot({ path: 'example.png' });
await browser.close();
```

#### Expected behavior
It should works

#### Actual behavior

An exception is throw:

```
message: spawn EACCES
stack: Error: spawn EACCES
at ChildProcess.spawn (internal/child_process.js:313:11)
at Object.exports.spawn (child_process.js:508:9)
at Launcher.launch (/home/site/wwwroot/node_modules/puppeteer/lib/Launcher.js:133:40)
at
```

#### Known workarounds

I don't know any.

#### Related information

According to this comment: https://github.com/Azure/azure-functions-host/issues/2417#issuecomment-366043565
It should work on linux, but we get the same error as in windows.

Start with the provided Azure Functions 2.0 Linux reproduction and the stack trace at node_modules/puppeteer/lib/Launcher.js:133:40. Investigate why Puppeteer's browser process receives spawn EACCES in this hosting environment, then verify the example function can launch, navigate, capture a screenshot, and close the browser successfully.

Written by the indexing model from the issue text.