This CL fixes some style issues and improves json output for the LoC
counting script tools/locs.py.

Notry: true
Change-Id: I0805904e44ab240945ef88dd8214abb8ae02cf7d
Reviewed-on: https://chromium-review.googlesource.com/c/1352271
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57873}