Reformat remaining gn files.

`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.

Most changes have landed by now via `git cl split`.
This is what remains after two weeks.

Bug: 1041419
Change-Id: Ia813d744e57e5647266a91d4f6c725bf921fb11c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2024471


Commit-Queue: Nico Weber <thakis@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#735958}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 852532f442a478b767bb452c63b5aa9b2e5e19fe