Busybody: Format GN files

This CL introduces no behavioral change. It was generated by issuing

```
git ls-files -- '*.gni' '*.gn' \
  | rg -v 'third_party/crashpad' \
  | xargs gn format
```

just to prevent unlucky folks from having to deal with a presubmit
error about formatting, forcing them to introduce an unrelated diff to
their CL.

This one is scoped to:
build/toolchain

This CL was uploaded by git cl split.

R=ovsienko@google.com

Bug: 515185457
Change-Id: I88320f1a6cf22be8f8796c69a0ec6914a371f676
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7883103
Reviewed-by: Junji Watanabe <jwata@google.com>
Auto-Submit: Kalvin Lee <kdlee@chromium.org>
Commit-Queue: Kalvin Lee <kdlee@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1639182}