Fix ESLint tests
Fix ESLint tests

The upgrade to ESLint 7.0.0 broke our custom rule tests. It seems
we were affected by https://github.com/eslint/eslint/issues/13293
after all.

R=993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org

Change-Id: I3dcf8b7e15f1bc6a26c2fa069f24241e87f07627
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2538840
Commit-Queue: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Commit-Queue: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>
Auto-Submit: Tim van der Lippe <dba8716ee7f8d16236046f74d2167cb94410f6ed@chromium.org>
Reviewed-by: Jack Franklin <993fcadce4d04090da2fefd557a0995e7966c8d5@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend