[SyncFS] Ensure to pass DB in some utilities

chrome/browser/sync_file_system/drive_backend/metadata_database_index.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 "chrome/browser/sync_file_system/drive_backend/metadata_database_index.h"
 
 #include "base/metrics/histogram.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 201 matching lines @@
                          service_metadata->sync_root_tracker_id(),
                          db);
 
   scoped_ptr<MetadataDatabaseIndex> index(new MetadataDatabaseIndex(db));
   index->Initialize(service_metadata.Pass(), &contents);
   return index.Pass();
 }
 
 // static
 scoped_ptr<MetadataDatabaseIndex>
-MetadataDatabaseIndex::CreateForTesting(DatabaseContents* contents) {
-  scoped_ptr<MetadataDatabaseIndex> index(new MetadataDatabaseIndex(NULL));
+MetadataDatabaseIndex::CreateForTesting(DatabaseContents* contents,
+                                        LevelDBWrapper* db) {
+  scoped_ptr<MetadataDatabaseIndex> index(new MetadataDatabaseIndex(db));
   index->Initialize(make_scoped_ptr(new ServiceMetadata), contents);
   return index.Pass();
 }
 
 void MetadataDatabaseIndex::Initialize(
     scoped_ptr<ServiceMetadata> service_metadata,
     DatabaseContents* contents) {
   service_metadata_ = service_metadata.Pass();
 
   for (size_t i = 0; i < contents->file_metadata.size(); ++i)
@@ skipping 499 matching lines @@
 
     DVLOG(3) << "  Remove from dirty_trackers_: " << tracker_id;
     dirty_trackers_.erase(tracker_id);
 
     demoted_dirty_trackers_.erase(tracker_id);
   }
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system