Refactor following sync commit loop change

sync/sessions/sync_session.cc

Index: sync/sessions/sync_session.cc
diff --git a/sync/sessions/sync_session.cc b/sync/sessions/sync_session.cc
index 85ac8ccd7b72b6785191bc3915ae544f96420bd4..254bea58a86dd50622ca7b62116f8184101ee783 100644
--- a/sync/sessions/sync_session.cc
+++ b/sync/sessions/sync_session.cc
@@ -234,13 +234,9 @@ bool IsError(SyncerError error) {
 bool SyncSession::Succeeded() const {
   const bool download_updates_error =
       IsError(status_controller_->error().last_download_updates_result);
-  const bool post_commit_error =
-      IsError(status_controller_->error().last_post_commit_result);
-  const bool process_commit_response_error =
-      IsError(status_controller_->error().last_process_commit_response_result);
-  return !download_updates_error
-      && !post_commit_error
-      && !process_commit_response_error;
+  const bool commit_error =
+      IsError(status_controller_->error().commit_result);
+  return !download_updates_error && !commit_error;
 }
 
 }  // namespace sessions