BUILD.gn: Fix formatting.

Bug: skia:9713
Change-Id: Ief84ae139acd000b29adcf32e0aead2fbdbff166
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259536
Reviewed-by: Derek Sollenberger <djsollen@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed