[feature_engagement] Add dfried@ as full owner.

Up until now, dfried@ has only been an owner of some files for
feature_engagement, but since they have been working in this area for
a long time now, it makes sense to make them a full owner.

R=dfried@chromium.org, dtrainor@chromium.org

Bug: None
Change-Id: I0ee44a3eca258b2b85bd05901062082d36d41ce5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4793784
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Reviewed-by: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1185415}

components/feature_engagement/OWNERS

@@ -1,3 +1,4 @@
+dfried@chromium.org
 dtrainor@chromium.org
 nyquist@chromium.org
 shaktisahu@chromium.org
@@ -9,9 +10,3 @@ per-file ...feature_constants.*=twellington@chromium.org
 per-file ...feature_list.*=twellington@chromium.org
 per-file ...EventConstants.java=twellington@chromium.org
 per-file ...FeatureConstants.java=twellington@chromium.org
-
-# For User Education/Feature Engagement on desktop platforms:
-per-file ...event_constants.*=dfried@chromium.org
-per-file ...feature_configurations.cc=dfried@chromium.org
-per-file ...feature_constants.*=dfried@chromium.org
-per-file ...feature_list.*=dfried@chromium.org