[USS] Show USS counters in about:sync page

components/sync/driver/sync_frontend.h

Index: components/sync/driver/sync_frontend.h
diff --git a/components/sync/driver/sync_frontend.h b/components/sync/driver/sync_frontend.h
index ae2239a33223cb6abcb4ba87218bc518abcfe9b1..e630b404dd67db829d1b2411415bac570cbe730c 100644
--- a/components/sync/driver/sync_frontend.h
+++ b/components/sync/driver/sync_frontend.h
@@ -79,11 +79,11 @@ class SyncFrontend {
       syncer::ModelType type,
       const syncer::UpdateCounters& counters) = 0;
 
-  // Called when we receive an updated status counter for a directory type.
+  // Called when we receive an updated status counter for a datatype.
   //
   // Disabled by default.  Enable by calling
   // EnableDirectoryTypeDebugInfoForwarding() on the backend.
-  virtual void OnDirectoryTypeStatusCounterUpdated(
+  virtual void OnDatatypeStatusCounterUpdated(
       syncer::ModelType type,
       const syncer::StatusCounters& counters) = 0;