[Sync] Stop updating local device info time stamp on merge.

components/sync/device_info/device_info_sync_bridge.cc

 // Copyright 2015 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 "components/sync/device_info/device_info_sync_bridge.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <set>
@@ skipping 124 matching lines @@
   std::string local_guid = local_info->guid();
   std::unique_ptr<WriteBatch> batch = store_->CreateWriteBatch();
   for (const auto& kv : entity_data_map) {
     const DeviceInfoSpecifics& specifics =
         kv.second.value().specifics.device_info();
     DCHECK_EQ(kv.first, specifics.cache_guid());
     if (specifics.cache_guid() == local_guid) {
       // Don't Put local data if it's the same as the remote copy.
       if (local_info->Equals(*SpecificsToModel(specifics))) {
         local_guids_to_put.erase(local_guid);
-      } else {
-        // This device is valid right now and this entry is about to be
-        // committed, use this as an opportunity to refresh the timestamp.
-        all_data_[local_guid]->set_last_updated_timestamp(
-            TimeToProtoTime(Time::Now()));
       }
     } else {
       // Remote data wins conflicts.
       local_guids_to_put.erase(specifics.cache_guid());
       has_changes = true;
       StoreSpecifics(base::MakeUnique<DeviceInfoSpecifics>(specifics),
                      batch.get());
     }
   }
 
@@ skipping 295 matching lines @@
 }
 
 void DeviceInfoSyncBridge::ReportStartupErrorToSync(const std::string& msg) {
   // TODO(skym): Shouldn't need to log this here, reporting should always log.
   LOG(WARNING) << msg;
   change_processor()->OnMetadataLoaded(
       change_processor()->CreateAndUploadError(FROM_HERE, msg), nullptr);
 }
 
 }  // namespace syncer