I tried enabling noshadowing in components/url_formatter but it triggered no warnings in my local configuration. Do you recall where the errors were?

I ran an older version of clang which didn't have warnings for shadowed enums. https://chromium-review.googlesource.com/c/chromium/src/+/1421104 has a potential fix. A bit bigger than I would have liked.

I see you found it :) Thank you for fixing it!