Avoid useless SYNC_CYCLE_CONTINUATION sync cycle

chrome/browser/sync/engine/syncer_error.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SYNC_ENGINE_SYNCER_ERROR_H_
+#define CHROME_BROWSER_SYNC_ENGINE_SYNCER_ERROR_H_
+#pragma once
+
+namespace browser_sync {
+
+enum SyncerError {
+  UNINITIALIZED = 0,       // default value
+  DIRECTORY_LOOKUP_FAILED, // local directory lookup failure
+
+  NETWORK_CONNECTION_UNAVAILABLE,  // connectivity failure
+  NETWORK_IO_ERROR,                // response buffer read error
+  SYNC_SERVER_ERROR,               // non auth HTTP error
+  SYNC_AUTH_ERROR,                 // HTTP auth error
+
+  // Based on values returned by server.  Most are defined in sync.proto.
+  SERVER_RETURN_INVALID_CREDENTIAL,
+  SERVER_RETURN_UNKNOWN_ERROR,
+  SERVER_RETURN_THROTTLED,
+  SERVER_RETURN_TRANSIENT_ERROR,
+  SERVER_RETURN_MIGRATION_DONE,
+  SERVER_RETURN_CLEAR_PENDING,
+  SERVER_RETURN_NOT_MY_BIRTHDAY,
+  SERVER_RESPONSE_VALIDATION_FAILED,
+
+  NO_ERROR,
+};
+
+const char * GetSyncerErrorString(SyncerError);
+
+}  // namespace browser_sync
+
+#endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCER_ERROR_H_