Revert 110555 - sync: Remove ModelNeutralExecuteImpl()

chrome/browser/sync/engine/model_changing_syncer_command.cc

Index: chrome/browser/sync/engine/model_changing_syncer_command.cc
===================================================================
--- chrome/browser/sync/engine/model_changing_syncer_command.cc	(revision 110571)
+++ chrome/browser/sync/engine/model_changing_syncer_command.cc	(working copy)
@@ -15,6 +15,9 @@
 
 void ModelChangingSyncerCommand::ExecuteImpl(sessions::SyncSession* session) {
   work_session_ = session;
+  if (!ModelNeutralExecuteImpl(work_session_)) {
+    return;
+  }
 
   // Project the list of active types (i.e., types in the routing
   // info) to a list of groups.
@@ -56,4 +59,9 @@
   }
 }
 
+bool ModelChangingSyncerCommand::ModelNeutralExecuteImpl(
+    sessions::SyncSession* session) {
+  return true;
+}
+
 }  // namespace browser_sync