fix: Page.waitForDevicePrompt crash

[thiagowfx]

Only call deviceRequestPromptManager() if the parent frame is not null.

Bug: #11072
Follow-up-of: #9299

[thiagowfx]

I'm not sure if this fix is correct though. @mzgoddard @outofambit thoughts?

I verified the crash doesn't happen anymore:

#!/usr/bin/env node
import puppeteer from 'puppeteer';

(async () => {
  const browser = await puppeteer.launch({
    devtools: true,
    headless: false,
    args: ['--enable-features=WebBluetoothNewPermissionsBackend'],
  });
  const mainPage = await browser.newPage();
  await mainPage.goto(
    'http://googlechrome.github.io/samples/web-bluetooth/get-devices-async-await.html'
  );
  await mainPage.waitForNetworkIdle();
  await mainPage.waitForDevicePrompt();
})();

[thiagowfx]

Note that the --args only works with this patch: #11152

[OrKoN]

LGTM Can we find a way to test it e2e on GitHub actions?

[thiagowfx]

I confirm the unit tests did not change. I'll see if there's a way to E2E.

[thiagowfx]

Tentative E2E: #11159