Revert of [SyncFS] Post tasks between SyncEngine and SyncWorker

chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc

Index: chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc b/chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc
index 1b6f950659594b1ed0e3ca0523cc6e35811af490..9cdbbf1dafad69f39bcc36c0d612284815f5c592 100644
--- a/chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc
+++ b/chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc
@@ -72,20 +72,20 @@
         new drive::DriveUploader(drive_service.get(),
                                  file_task_runner_.get()));
 
-    fake_drive_service_helper_.reset(new FakeDriveServiceHelper(
-        drive_service.get(), uploader.get(),
-        kSyncRootFolderTitle));
-
     remote_sync_service_.reset(new SyncEngine(
         drive_service.PassAs<drive::DriveServiceInterface>(),
         uploader.Pass(),
-        file_task_runner_.get(),
         NULL, NULL, NULL));
     remote_sync_service_->AddServiceObserver(this);
-    remote_sync_service_->Initialize(base_dir_.path(),
-                                     base::MessageLoopProxy::current(),
-                                     in_memory_env_.get());
+    remote_sync_service_->Initialize(
+        base_dir_.path(),
+        file_task_runner_.get(),
+        in_memory_env_.get());
     remote_sync_service_->SetSyncEnabled(true);
+
+    fake_drive_service_helper_.reset(new FakeDriveServiceHelper(
+        fake_drive_service(), drive_uploader(),
+        kSyncRootFolderTitle));
 
     local_sync_service_->SetLocalChangeProcessor(remote_sync_service_.get());
     remote_sync_service_->SetRemoteChangeProcessor(local_sync_service_.get());
@@ -464,6 +464,10 @@
         remote_sync_service_->GetDriveService());
   }
 
+  drive::DriveUploaderInterface* drive_uploader() {
+    return remote_sync_service_->GetDriveUploader();
+  }
+
   FakeDriveServiceHelper* fake_drive_service_helper() {
     return fake_drive_service_helper_.get();
   }