[owners] Ensure OWNERS file ends with newline in //remoting

Some OWNERS file ends with a newline character, some don't. As
text editor tends to add newline at the end of text files when
saving, normalize all OWNERS files to end with a newline '\n'.

Bug: none
Change-Id: I2f486b4894c17bd2cf08e71bd8199f1d57c0e175
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2905759
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#884944}