[Sync] Ensure all values of SyncProtocolErrorType are handled in ShouldRequestEarlyExit

sync/protocol/sync_protocol_error.h

 // Copyright 2012 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 SYNC_PROTOCOL_SYNC_PROTOCOL_ERROR_H_
 #define SYNC_PROTOCOL_SYNC_PROTOCOL_ERROR_H_
 
 #include <string>
 
 #include "base/values.h"
 #include "sync/base/sync_export.h"
@@ skipping 10 matching lines @@
 
   // Server is busy. Try later.
   THROTTLED,
 
   // Clear user data is being currently executed by the server.
   CLEAR_PENDING,
 
   // Server cannot service the request now.
   TRANSIENT_ERROR,
 
-  // Server does not wish the client to retry any more until the action has
-  // been taken.
-  NON_RETRIABLE_ERROR,
-
   // Indicates the datatypes have been migrated and the client should resync
   // them to get the latest progress markers.
   MIGRATION_DONE,
 
   // Invalid Credential.
   INVALID_CREDENTIAL,
 
   // An administrator disabled sync for this domain.
   DISABLED_BY_ADMIN,
 
@@ skipping 55 matching lines @@
   SyncProtocolError();
   ~SyncProtocolError();
   base::DictionaryValue* ToValue() const;
 };
 
 SYNC_EXPORT const char* GetSyncErrorTypeString(SyncProtocolErrorType type);
 SYNC_EXPORT const char* GetClientActionString(ClientAction action);
 }  // namespace syncer
 #endif  // SYNC_PROTOCOL_SYNC_PROTOCOL_ERROR_H_