Remove kjellander@ and torbjorng@ from OWNERS.

torbjorng@ has left Google and kjellander@ will in a month.
Replacing remaining ownership (after some cleanup) with
phoglund@.

BUG=libyuv:739
NOTRY=True

Change-Id: I228f2d87008f5f9cbce1ac88dc51c7f2ad6192c0
Reviewed-on: https://chromium-review.googlesource.com/680934Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Henrik Kjellander <kjellander@chromium.org>

OWNERS

 fbarchard@chromium.org
 magjed@chromium.org
-torbjorng@chromium.org
 
-per-file *.gyp=kjellander@chromium.org
-per-file *.gn=kjellander@chromium.org
+per-file *.gn=phoglund@chromium.org
 per-file .gitignore=*
 per-file AUTHORS=*
 per-file DEPS=*
-per-file PRESUBMIT.py=kjellander@chromium.org
-per-file gyp_libyuv.py=kjellander@chromium.org
-per-file setup_links.py=*
-per-file sync_chromium.py=kjellander@chromium.org
+per-file PRESUBMIT.py=phoglund@chromium.org