[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/internal_api/public/engine/sync_status.h

Index: sync/internal_api/public/engine/sync_status.h
diff --git a/sync/internal_api/public/engine/sync_status.h b/sync/internal_api/public/engine/sync_status.h
index 5e330ac0f8620dd71f55c1bd115c3c668420134a..2c0e5cf2db49b48d5177f0c2470333b53fa4ef03 100644
--- a/sync/internal_api/public/engine/sync_status.h
+++ b/sync/internal_api/public/engine/sync_status.h
@@ -29,7 +29,7 @@ struct SyncStatus {
   // Notifications counters updated by the actions in synapi.
   int notifications_received;
 
-  syncer::SyncProtocolError sync_protocol_error;
+  SyncProtocolError sync_protocol_error;
 
   // Number of encryption conflicts counted during most recent sync cycle.
   int encryption_conflicts;
@@ -80,12 +80,12 @@ struct SyncStatus {
   int useful_sync_cycles;
 
   // Encryption related.
-  syncer::ModelTypeSet encrypted_types;
+  ModelTypeSet encrypted_types;
   bool cryptographer_ready;
   bool crypto_has_pending_keys;
 
   // Per-datatype throttled status.
-  syncer::ModelTypeSet throttled_types;
+  ModelTypeSet throttled_types;
 
   // The unique identifer for this client.
   std::string unique_id;