Make update over cellular an option for user

chromeos/dbus/fake_update_engine_client.cc

Index: chromeos/dbus/fake_update_engine_client.cc
diff --git a/chromeos/dbus/fake_update_engine_client.cc b/chromeos/dbus/fake_update_engine_client.cc
index 9e89f1ed2a9d9059fadc25a78f7653c24fb195e8..e6df858c8f8cbd289f9fbe3d9fe18e1caa5f7f90 100644
--- a/chromeos/dbus/fake_update_engine_client.cc
+++ b/chromeos/dbus/fake_update_engine_client.cc
@@ -93,6 +93,11 @@ void FakeUpdateEngineClient::SetUpdateOverCellularPermission(
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
 }
 
+void FakeUpdateEngineClient::SetUpdateOverCellularTarget(
+    const std::string& target_version,
+    int64_t target_size,
+    const SetUpdateOverCellularTargetCallback& callback) {}
+
 void FakeUpdateEngineClient::set_default_status(
     const UpdateEngineClient::Status& status) {
   default_status_ = status;