[NTP] Fix comment formatting

Fix formatting of comments and some spacing across the javascript files.

Change-Id: Ia4950ff7edcbb020c7395e71b971b091ec83e2c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1659708
Commit-Queue: Kristi Park <kristipark@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669403}
10 files changed