Pretty-print JS in devtools doesn't work

[nornagon]

To repro:

1. Launch an Electron app (hello world/default fiddle will do)
2. Open DevTools
3. Find a minified JS file, e.g. renderer_init.js
4. Click the "Pretty Print" button in DevTools

Expected behavior:
The JS in the DevTools view is replaced with a pretty-printed version of the code

Actual behavior:
The JS in the DevTools view is unchanged

Bisected to v11.0.0-nightly.20200721...v11.0.0-nightly.20200723

[nornagon]

There was a Chrome roll in that range: #24575

That chrome roll included a number of DevTools frontend changes: https://chromium.googlesource.com/devtools/devtools-frontend/+log/9e33bc96e1997d634b944744bc347da330daf1c6..57d7441b354d2bcc3a10b5721941fa59e30068ab

[nornagon]

Possibly this? https://chromium.googlesource.com/devtools/devtools-frontend/+/45fb1f2ebb99ec7146ad3f489831d9c39aa78f18