Run gn format on all gni files (gn version 307087)

Change generated by running the following command:

for x in `git ls-files *.gni`; do gn format --in-place $x; done

This came up as an issue in https://codereview.chromium.org/801523002/, but I
didn't want to add noise to that CL.

R=qsr@chromium.org, qsr

Review URL: https://codereview.chromium.org/794413003