SyncFS: Fix LocalSyncOperationResolverTest to cover all test cases

chrome/browser/sync_file_system/drive_file_sync_service.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 "chrome/browser/sync_file_system/drive_file_sync_service.h"
 
 #include <algorithm>
 #include <string>
 #include <utility>
 
@@ skipping 1056 matching lines @@
 
   RemoteChange remote_change;
   const bool has_remote_change = GetPendingChangeForFileSystemURL(
       url, &remote_change);
   if (has_remote_change && param->drive_metadata.resource_id().empty())
     param->drive_metadata.set_resource_id(remote_change.resource_id);
 
   LocalSyncOperationType operation =
       LocalSyncOperationResolver::Resolve(
           local_file_change,
-          has_remote_change,
-          remote_change.change,
+          has_remote_change ? &remote_change.change : NULL,
           param->has_drive_metadata ? &drive_metadata : NULL);
 
   DVLOG(1) << "ApplyLocalChange for " << url.DebugString()
            << " local_change:" << local_file_change.DebugString()
            << " ==> operation:" << operation;
 
   switch (operation) {
     case LOCAL_SYNC_OPERATION_ADD_FILE:
       sync_client_->UploadNewFile(
           origin_resource_id,
@@ skipping 1330 matching lines @@
       pending_batch_sync_origins_.insert(origin);
   }
   callback.Run(status, resource_id);
 }
 
 std::string DriveFileSyncService::sync_root_resource_id() {
   return metadata_store_->sync_root_directory();
 }
 
 }  // namespace sync_file_system