update_engine: fix english

Fix the english for accuracy regarding DLC.

BUG=chromium:897882
TEST=None

Change-Id: I72ab9ecb7903bb5fb35597222cd7c8b1f4244cfc
Reviewed-on: https://chromium-review.googlesource.com/1351359
Commit-Ready: Xiaochu Liu <xiaochu@chromium.org>
Tested-by: Xiaochu Liu <xiaochu@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
diff --git a/client_library/client_dbus.cc b/client_library/client_dbus.cc
index 2257d2e..e0d1f64 100644
--- a/client_library/client_dbus.cc
+++ b/client_library/client_dbus.cc
@@ -57,14 +57,14 @@
       nullptr);
 }
 
-bool DBusUpdateEngineClient::AttemptInstall(const string& omaha_url,
-                                            const vector<string>& dlc_ids) {
+bool DBusUpdateEngineClient::AttemptInstall(
+    const string& omaha_url, const vector<string>& dlc_module_ids) {
   // Convert parameters into protobuf.
   chromeos_update_engine::DlcParameters dlc_parameters;
   dlc_parameters.set_omaha_url(omaha_url);
-  for (const auto& dlc_id : dlc_ids) {
+  for (const auto& dlc_module_id : dlc_module_ids) {
     chromeos_update_engine::DlcInfo* dlc_info = dlc_parameters.add_dlc_infos();
-    dlc_info->set_dlc_id(dlc_id);
+    dlc_info->set_dlc_id(dlc_module_id);
   }
   string dlc_request;
   if (dlc_parameters.SerializeToString(&dlc_request)) {