Swap myself with Christian for content_settings OWNERS

Change-Id: I1910e309ceae7816f0a8bc1ddda5cd44672ab681
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2124251Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753984}

components/content_settings/OWNERS

+dullweber@chromium.org
 engedy@chromium.org
-jochen@chromium.org
 msramek@chromium.org
 
 # COMPONENT: Internals>Permissions>Model