PROTOCOL_TIMEOUT from `redirects-http`

consistent repro for me locally with CLI.
Doesn't happen in CDT.
Error in LR (when PWA checked): `Rendering canceled - timeout during idle.`

ref #6512

```
yarn start https://www.delicious.com.au/ --only-audits=redirects-http

...

waitFor:warn Timed out waiting for page load. Checking if page is hung... +54s
waitFor:warn Page appears to be hung, killing JavaScript... +11s
status Disconnecting from browser... +42s
ChromeLauncher Killing Chrome instance 41162 +1ms
Driver:warn clearDataForOrigin timed out +11s
GatherRunner disconnect:error connect ECONNREFUSED 127.0.0.1:50656 +22ms
CLI:warn Warning: Chrome process could not be killed because it already exited. +171ms
Runtime error encountered: Waiting for DevTools protocol response has exceeded the allotted time. (Method: Emulation.setScriptExecutionDisabled)
LHError: PROT (shutup bot) OCOL_TIMEOUT
at Timeout. (/Users/cjamcl/src/lighthouse/lighthouse-core/gather/driver.js:322:21)
at listOnTimeout (internal/timers.js:531:17)
at processTimers (internal/timers.js:475:7)
error Command failed with exit code 1.
```