sync: Refactor update application

sync/engine/syncer_util.cc

 // Copyright (c) 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.
 
 #include "sync/engine/syncer_util.h"
 
 #include <algorithm>
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 166 matching lines @@
       return local_entry.Get(ID);
     }
   }
   // Fallback: target an entry having the server ID, creating one if needed.
   return update_id;
 }
 
 UpdateAttemptResponse AttemptToUpdateEntry(
     syncable::WriteTransaction* const trans,
     syncable::MutableEntry* const entry,
-    ConflictResolver* resolver,
     Cryptographer* cryptographer) {
   CHECK(entry->good());
   if (!entry->Get(IS_UNAPPLIED_UPDATE))
     return SUCCESS;  // No work to do.
   syncable::Id id = entry->Get(ID);
   const sync_pb::EntitySpecifics& specifics = entry->Get(SERVER_SPECIFICS);
 
   // Only apply updates that we can decrypt. If we can't decrypt the update, it
   // is likely because the passphrase has not arrived yet. Because the
   // passphrase may not arrive within this GetUpdates, we can't just return
@@ skipping 447 matching lines @@
   if (update.version() < target->Get(SERVER_VERSION)) {
     LOG(WARNING) << "Update older than current server version for "
                  << *target << " Update:"
                  << SyncerProtoUtil::SyncEntityDebugString(update);
     return VERIFY_SUCCESS;  // Expected in new sync protocol.
   }
   return VERIFY_UNDECIDED;
 }
 
 }  // namespace syncer