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

components/sync/protocol/user_event_specifics.proto

Index: components/sync/protocol/user_event_specifics.proto
diff --git a/components/sync/protocol/user_event_specifics.proto b/components/sync/protocol/user_event_specifics.proto
index 7a3aab7d41286c79b3b2f4f11a038038562d66ac..0a650b4b9b84e4d5456372f510a56d7faed98945 100644
--- a/components/sync/protocol/user_event_specifics.proto
+++ b/components/sync/protocol/user_event_specifics.proto
@@ -13,12 +13,12 @@ option optimize_for = LITE_RUNTIME;
 
 package sync_pb;
 
-message FieldTrialEvent {
-  message FieldTrial {
+message FieldTrial {
+  message FieldTrialPair {
     optional fixed32 name_id = 1;
     optional fixed32 group_id = 2;
   }
-  repeated FieldTrial field_trials = 1;
+  repeated FieldTrialPair field_trial_pairs = 1;
 }
 
 // Language detection output.
@@ -86,7 +86,7 @@ message UserEventSpecifics {
 
   oneof event {
     Test test = 8;
-    FieldTrialEvent field_trial_event = 9;
+    FieldTrial field_trial = 9;
     LanguageDetection language_detection = 10;

[bartekg, 2017/06/16 04:02:30]

An alternative would be to rename all fields in this oneof to foo_event

Maybe it would make it easier to distinguish them from other fields in the code?

[skym, 2017/06/19 21:29:07]

Done.

     Translation translation = 11;
   }