Add robertogden to DRP OWNERS

Why not?

Change-Id: I7646e3baa578682774a60d4223ce09e1a2c7d649
Reviewed-on: https://chromium-review.googlesource.com/c/1358917Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613151}

chrome/browser/ui/webui/interventions_internals/OWNERS

-ryansturm@chromium.org
-tbansal@chromium.org
+file://components/data_reduction_proxy/OWNERS
 
 per-file *.mojom=set noparent
 per-file *.mojom=file://ipc/SECURITY_OWNERS

components/data_reduction_proxy/OWNERS

@@ -2,6 +2,7 @@
 tbansal@chromium.org
 dougarnett@chromium.org
 rajendrant@chromium.org
+robertogden@chromium.org
 ryansturm@chromium.org
 sclittle@chromium.org