Appropriate handling for Cellular First devices.

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 078a74d25965a075a66df9fa8c2631cca76415fc..9e89f1ed2a9d9059fadc25a78f7653c24fb195e8 100644
--- a/chromeos/dbus/fake_update_engine_client.cc
+++ b/chromeos/dbus/fake_update_engine_client.cc
@@ -87,6 +87,12 @@ void FakeUpdateEngineClient::GetEolStatus(
       base::Bind(callback, update_engine::EndOfLifeStatus::kSupported));
 }
 
+void FakeUpdateEngineClient::SetUpdateOverCellularPermission(
+    bool allowed,
+    const base::Closure& callback) {
+  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, callback);
+}
+
 void FakeUpdateEngineClient::set_default_status(
     const UpdateEngineClient::Status& status) {
   default_status_ = status;