Reformat all gn files in /ios/net.

`gn format` recently changed its formatting behavior
for deps, source, and a few other elements when they
are assigned (with =) single-element lists to be consistent
with the formatting of updates (with +=) with single-element.

Now that we've rolled in a GN binary with the change,
reformat all files so that people don't get presubmit
warnings due to this.

This CL was uploaded by git cl split.

R=ellyjones@chromium.org

Bug: 1041419
Change-Id: I72d3b5e84d0d60712bb7064d1e3a9d77a4a77043
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1998509
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731502}

• ios/net/BUILD.gn[diff]