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

components/sync/device_info/device_info_sync_bridge.cc

Index: components/sync/device_info/device_info_sync_bridge.cc
diff --git a/components/sync/device_info/device_info_sync_bridge.cc b/components/sync/device_info/device_info_sync_bridge.cc
index 394fbd6eb2e27174d7010f59d23e956b136c862a..c762c909a3d6d0b96e4505b34fa15cb8861ce57c 100644
--- a/components/sync/device_info/device_info_sync_bridge.cc
+++ b/components/sync/device_info/device_info_sync_bridge.cc
@@ -142,11 +142,6 @@ SyncError DeviceInfoSyncBridge::MergeSyncData(
       // 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.