Remove log spams from update_engine

Test: th
Change-Id: Iae390dc07eced25fd9f0d6d45a3716b73237bf7a
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index 367dedc..e61870b 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -1409,7 +1409,6 @@
   }
   TEST_AND_RETURN_FALSE(
       prefs_->SetInt64(kPrefsUpdateStateNextOperation, next_operation_num_));
-  LOG(INFO) << "Update progress successfully checkpointed.";
   return true;
 }