drive: Deal with the root directory in the same way as others in MoveOperation.

chrome/browser/google_apis/gdata_wapi_service.cc

Index: chrome/browser/google_apis/gdata_wapi_service.cc
diff --git a/chrome/browser/google_apis/gdata_wapi_service.cc b/chrome/browser/google_apis/gdata_wapi_service.cc
index 2e4e056ea7d4e185d059791091aa900cf26aff68..c1fcd8520710e06adf906c1e445893e10407daba 100644
--- a/chrome/browser/google_apis/gdata_wapi_service.cc
+++ b/chrome/browser/google_apis/gdata_wapi_service.cc
@@ -444,6 +444,7 @@ void GDataWapiService::RemoveResourceFromDirectory(
   runner_->StartOperationWithRetry(
       new RemoveResourceFromDirectoryOperation(operation_registry(),
                                                url_request_context_getter_,
+                                               url_generator_,
                                                callback,
                                                parent_content_url,
                                                resource_id));