[FileAPI] Replace default leveldb::Env with leveldb::MemEnv in tests.

chrome/browser/sync_file_system/sync_file_system_service_factory.cc

 // Copyright (c) 2013 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/sync_file_system_service_factory.h"
 
 #include "base/command_line.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_service.h"
 #include "chrome/browser/sync_file_system/sync_file_system_service.h"
@@ skipping 42 matching lines @@
 
 SyncFileSystemServiceFactory::~SyncFileSystemServiceFactory() {}
 
 BrowserContextKeyedService*
 SyncFileSystemServiceFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
   Profile* profile = Profile::FromBrowserContext(context);
 
   SyncFileSystemService* service = new SyncFileSystemService(profile);
 
-  scoped_ptr<LocalFileSyncService> local_file_service(
-      new LocalFileSyncService(profile));
+  scoped_ptr<LocalFileSyncService> local_file_service =
+      LocalFileSyncService::Create(profile);
 
   scoped_ptr<RemoteFileSyncService> remote_file_service;
   if (mock_remote_file_service_) {
     remote_file_service = mock_remote_file_service_.Pass();
   } else if (IsV2Enabled()) {
     remote_file_service = RemoteFileSyncService::CreateForBrowserContext(
         RemoteFileSyncService::V2, context);
   } else {
     remote_file_service = RemoteFileSyncService::CreateForBrowserContext(
         RemoteFileSyncService::V1, context);
   }
 
   if (CommandLine::ForCurrentProcess()->HasSwitch(kDisableLastWriteWin)) {
     remote_file_service->SetConflictResolutionPolicy(
         CONFLICT_RESOLUTION_POLICY_MANUAL);
   }
 
   service->Initialize(local_file_service.Pass(),
                       remote_file_service.Pass());
   return service;
 }
 
 }  // namespace sync_file_system