Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/store_timestamps_command.cc

Index: chrome/browser/sync/engine/store_timestamps_command.cc
diff --git a/chrome/browser/sync/engine/store_timestamps_command.cc b/chrome/browser/sync/engine/store_timestamps_command.cc
index 140191b4d0e1b727dabf852951253f35d70126e4..a8c83a9c01d4be6cccabcd949ed6af79ccb7048b 100644
--- a/chrome/browser/sync/engine/store_timestamps_command.cc
+++ b/chrome/browser/sync/engine/store_timestamps_command.cc
@@ -15,13 +15,14 @@ namespace browser_sync {
 StoreTimestampsCommand::StoreTimestampsCommand() {}
 StoreTimestampsCommand::~StoreTimestampsCommand() {}
 
-void StoreTimestampsCommand::ExecuteImpl(sessions::SyncSession* session) {
+SyncerError StoreTimestampsCommand::ExecuteImpl(
+    sessions::SyncSession* session) {
   syncable::ScopedDirLookup dir(session->context()->directory_manager(),
                                 session->context()->account_name());
 
   if (!dir.good()) {
     LOG(ERROR) << "Scoped dir lookup failed!";
-    return;
+    return DIRECTORY_LOOKUP_FAILED;
   }
 
   const GetUpdatesResponse& updates =
@@ -58,6 +59,8 @@ void StoreTimestampsCommand::ExecuteImpl(sessions::SyncSession* session) {
     DVLOG(1) << "Changes remaining: " << changes_left;
     status->set_num_server_changes_remaining(changes_left);
   }
+
+  return NO_ERROR;
 }
 
 }  // namespace browser_sync