[devtools] Remove dead code

This code is no longer called so it can be removed.

Change-Id: I25c00ab9e19220bc2c57d872004539bff0de72df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5464202


Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Dave Tapuska <dtapuska@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1289439}