FileAPI/sync file system cleanups for scoped_refptr operator T* cleanup.

chrome/browser/sync_file_system/drive_backend/sync_engine.cc

Index: chrome/browser/sync_file_system/drive_backend/sync_engine.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_engine.cc b/chrome/browser/sync_file_system/drive_backend/sync_engine.cc
index 84a2ed54e1698241d9119d0ee9a7139ee35d587d..f5ea2a975feeb2bfb21f78df431161902af2c272 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_engine.cc
+++ b/chrome/browser/sync_file_system/drive_backend/sync_engine.cc
@@ -714,16 +714,16 @@ void SyncEngine::GoogleSignedOut(const std::string& username) {
 }
 
 SyncEngine::SyncEngine(
-    base::SingleThreadTaskRunner* ui_task_runner,
-    base::SequencedTaskRunner* worker_task_runner,
-    base::SequencedTaskRunner* drive_task_runner,
+    const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+    const scoped_refptr<base::SequencedTaskRunner>& worker_task_runner,
+    const scoped_refptr<base::SequencedTaskRunner>& drive_task_runner,
     const base::FilePath& sync_file_system_dir,
     TaskLogger* task_logger,
     drive::DriveNotificationManager* notification_manager,
     ExtensionServiceInterface* extension_service,
     SigninManagerBase* signin_manager,
     OAuth2TokenService* token_service,
-    net::URLRequestContextGetter* request_context,
+    const scoped_refptr<net::URLRequestContextGetter>& request_context,
     scoped_ptr<DriveServiceFactory> drive_service_factory,
     leveldb::Env* env_override)
     : ui_task_runner_(ui_task_runner),