[Sync] SyncEngine refactor part 1: interfaces.

components/sync/driver/model_association_manager.h

Index: components/sync/driver/model_association_manager.h
diff --git a/components/sync/driver/model_association_manager.h b/components/sync/driver/model_association_manager.h
index 40d9bba35a2ad48e60d34f9a557c1a804611fcac..2f8bd9d9a237fa01c0e584b009bc56ab92a78ee1 100644
--- a/components/sync/driver/model_association_manager.h
+++ b/components/sync/driver/model_association_manager.h
@@ -29,7 +29,7 @@ class DataTypeController;
 class ModelAssociationManagerDelegate {
  public:
   // Called when all desired types are ready to be configured with
-  // BackendDataTypeConfigurer. Data type is ready when its progress marker is
+  // ModelTypeConfigurer. Data type is ready when its progress marker is
   // available to configurer. Directory data types are always ready, their
   // progress markers are read from directory. USS data type controllers need to
   // load model and read data type context first.