Fix memory leak in Sync FakeServerEntity

sync/test/fake_server/fake_server.cc

 // Copyright 2014 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/test/fake_server/fake_server.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 #include <vector>
@@ skipping 270 matching lines @@
     return false;
   }
 
   bool send_encryption_keys_based_on_nigori = false;
   int64 max_response_version = 0;
   for (EntityMap::iterator it = entities_.begin(); it != entities_.end();
        ++it) {
     FakeServerEntity* entity = it->second;
     if (sieve->ClientWantsItem(entity)) {
       sync_pb::SyncEntity* response_entity = response->add_entries();
-      response_entity->CopyFrom(*(entity->SerializeAsProto()));
+      entity->SerializeAsProto(response_entity);
       max_response_version = std::max(max_response_version,
                                       response_entity->version());
 
       if (entity->GetModelType() == syncer::NIGORI) {
         send_encryption_keys_based_on_nigori =
             response_entity->specifics().nigori().passphrase_type() ==
                 sync_pb::NigoriSpecifics::KEYSTORE_PASSPHRASE;
       }
     }
   }
@@ skipping 212 matching lines @@
 
 void FakeServer::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void FakeServer::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 }  // namespace fake_server