Refactor following sync commit loop change

sync/engine/model_changing_syncer_command.cc

Index: sync/engine/model_changing_syncer_command.cc
diff --git a/sync/engine/model_changing_syncer_command.cc b/sync/engine/model_changing_syncer_command.cc
index 94097468805f3010938fc40f80b1768b88dda989..f6da0f37d52769d7e695d99d6ba7677c3194427d 100644
--- a/sync/engine/model_changing_syncer_command.cc
+++ b/sync/engine/model_changing_syncer_command.cc
@@ -15,10 +15,7 @@ namespace browser_sync {
 SyncerError ModelChangingSyncerCommand::ExecuteImpl(
     sessions::SyncSession* session) {
   work_session_ = session;
-  SyncerError result = ModelNeutralExecuteImpl(work_session_);
-
-  if (result != SYNCER_OK)
-    return result;
+  SyncerError result = SYNCER_OK;
 
   const std::set<ModelSafeGroup>& groups_to_change =
       GetGroupsToChange(*work_session_);
@@ -51,9 +48,4 @@ SyncerError ModelChangingSyncerCommand::ExecuteImpl(
   return result;
 }
 
-SyncerError ModelChangingSyncerCommand::ModelNeutralExecuteImpl(
-    sessions::SyncSession* session) {
-  return SYNCER_OK;
-}
-
 }  // namespace browser_sync