Remove implicit conversions from scoped_refptr to T* in chrome/browser/sync_file_system/

chrome/browser/sync_file_system/drive_backend/drive_uploader_on_worker.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/drive_uploader_on_worker.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 30 matching lines @@
   ui_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&DriveUploaderWrapper::UploadNewFile,
                  wrapper_,
                  parent_resource_id,
                  local_file_path,
                  title,
                  content_type,
                  options,
                  RelayCallbackToTaskRunner(
-                     worker_task_runner_,
-                     FROM_HERE,
-                     callback)));
+                     worker_task_runner_.get(), FROM_HERE, callback)));
 
   return google_apis::CancelCallback();
 }
 
 google_apis::CancelCallback DriveUploaderOnWorker::UploadExistingFile(
       const std::string& resource_id,
       const base::FilePath& local_file_path,
       const std::string& content_type,
       const UploadExistingFileOptions& options,
       const drive::UploadCompletionCallback& callback,
       const google_apis::ProgressCallback& progress_callback) {
   DCHECK(sequece_checker_.CalledOnValidSequencedThread());
 
   ui_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&DriveUploaderWrapper::UploadExistingFile,
                  wrapper_,
                  resource_id,
                  local_file_path,
                  content_type,
                  options,
                  RelayCallbackToTaskRunner(
-                     worker_task_runner_,
-                     FROM_HERE,
-                     callback)));
+                     worker_task_runner_.get(), FROM_HERE, callback)));
 
   return google_apis::CancelCallback();
 }
 
 google_apis::CancelCallback DriveUploaderOnWorker::ResumeUploadFile(
       const GURL& upload_location,
       const base::FilePath& local_file_path,
       const std::string& content_type,
       const drive::UploadCompletionCallback& callback,
       const google_apis::ProgressCallback& progress_callback) {
   NOTREACHED();
   return google_apis::CancelCallback();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system