[Sync] Clean up ProfileSyncService observer events

chrome/browser/sync/profile_sync_service_observer.h

Index: chrome/browser/sync/profile_sync_service_observer.h
diff --git a/chrome/browser/sync/profile_sync_service_observer.h b/chrome/browser/sync/profile_sync_service_observer.h
index 9916c5dc3eaf09fa7c4628c53fc5ca16d79d338b..5073ccb872a0409a6642ba6333f730b42b8150fd 100644
--- a/chrome/browser/sync/profile_sync_service_observer.h
+++ b/chrome/browser/sync/profile_sync_service_observer.h
@@ -12,9 +12,12 @@ class ProfileSyncServiceObserver {
   // When one of the following events occurs, OnStateChanged() is called.
   // Observers should query the service to determine what happened.
   // - We initialized successfully.
-  // - There was an authentication error and the user needs to reauthenticate.
   // - The sync servers are unavailable at this time.
   // - Credentials are now in flight for authentication.
+  // - The data type configuration has started or ended.
+  // - Sync shut down.
+  // - Sync errors (passphrase, auth, unrecoverable, actionable, etc.).
+  // - Encryption changes.
   virtual void OnStateChanged() = 0;
 
   // If a client wishes to handle sync cycle completed events in a special way,