[SyncFS] Remove usage of file task runner under drive_backend/

chrome/browser/sync_file_system/drive_backend/sync_engine_initializer_unittest.cc

 // Copyright 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/drive_backend/sync_engine_initializer.h"
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 39 matching lines @@
     in_memory_env_.reset(leveldb::NewMemEnv(leveldb::Env::Default()));
 
     scoped_ptr<drive::DriveServiceInterface>
         fake_drive_service(new drive::FakeDriveService);
 
     sync_context_.reset(new SyncEngineContext(
         fake_drive_service.Pass(),
         scoped_ptr<drive::DriveUploaderInterface>(),
         NULL,
         base::ThreadTaskRunnerHandle::Get(),
-        base::ThreadTaskRunnerHandle::Get(),
         base::ThreadTaskRunnerHandle::Get()));
 
     sync_task_manager_.reset(new SyncTaskManager(
         base::WeakPtr<SyncTaskManager::Client>(),
         1 /* maximum_parallel_task */,
         base::ThreadTaskRunnerHandle::Get()));
     sync_task_manager_->Initialize(SYNC_STATUS_OK);
   }
 
   virtual void TearDown() OVERRIDE {
@@ skipping 33 matching lines @@
   }
 
   SyncStatusCode PopulateDatabase(
       const google_apis::FileResource& sync_root,
       const google_apis::FileResource** app_roots,
       size_t app_roots_count) {
     SyncStatusCode status = SYNC_STATUS_UNKNOWN;
     scoped_ptr<MetadataDatabase> database;
     MetadataDatabase::Create(
         base::ThreadTaskRunnerHandle::Get(),
-        base::ThreadTaskRunnerHandle::Get(),
         database_path(),
         in_memory_env_.get(),
         CreateResultReceiver(&status, &database));
     base::RunLoop().RunUntilIdle();
     if (status != SYNC_STATUS_OK)
       return status;
 
     // |app_root_list| must not own the resources here. Be sure to call
     // weak_clear later.
     ScopedVector<google_apis::FileResource> app_root_list;
@@ skipping 227 matching lines @@
 
   EXPECT_EQ(0u, CountTrackersForFile(sync_root->file_id()));
   EXPECT_FALSE(HasNoParent(sync_root->file_id()));
 
   EXPECT_EQ(1u, CountFileMetadata());
   EXPECT_EQ(1u, CountFileTracker());
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system