[Sync] Make children messages of UserEventSpecifics' consistent use event suffix.

components/sync/protocol/proto_visitors.h

Index: components/sync/protocol/proto_visitors.h
diff --git a/components/sync/protocol/proto_visitors.h b/components/sync/protocol/proto_visitors.h
index a4a96721235720a5cafc16a948a62a25878aecd3..58e383cc4f93e21c35f857e1c0d8c4ac95e637b8 100644
--- a/components/sync/protocol/proto_visitors.h
+++ b/components/sync/protocol/proto_visitors.h
@@ -472,13 +472,13 @@ VISIT_PROTO_FIELDS(const sync_pb::FaviconTrackingSpecifics& proto) {
   VISIT(is_bookmarked);
 }
 
-VISIT_PROTO_FIELDS(const sync_pb::FieldTrialEvent::FieldTrial& proto) {
+VISIT_PROTO_FIELDS(const sync_pb::FieldTrial::FieldTrialPair& proto) {
   VISIT(name_id);
   VISIT(group_id);
 }
 
-VISIT_PROTO_FIELDS(const sync_pb::FieldTrialEvent& proto) {
-  VISIT_REP(field_trials);
+VISIT_PROTO_FIELDS(const sync_pb::FieldTrial& proto) {
+  VISIT_REP(field_trial_pairs);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::GcmChannelFlags& proto) {
@@ -878,7 +878,7 @@ VISIT_PROTO_FIELDS(const sync_pb::UserEventSpecifics& proto) {
   VISIT(navigation_id);
   VISIT(session_id);
   VISIT(test);
-  VISIT(field_trial_event);
+  VISIT(field_trial);
   VISIT(language_detection);
   VISIT(translation);
 }