Adjust for removed Reference::refModel() method #29940

Job	Run time
Smoke (latest, Phpunit)	33s
Docs	35s
Smoke (latest, CodingStyle)	44s
Behat (8.1, Chrome)	5m 34s
Unit (7.4, Phpunit)	1m 56s
Smoke (latest, StaticAnalysis)	39s
Behat (8.1, Chrome Lowest)	5m 41s
Unit (7.4, Phpunit Lowest)	2m 8s
Behat (8.2, Chrome)	5m 47s
Unit (8.0, Phpunit)	2m 2s
Behat (8.2, Chrome Lowest)	5m 25s
Unit (8.0, Phpunit Lowest)	2m 9s
Behat (8.3, Chrome)	5m 5s
Unit (8.1, Phpunit)	2m 4s
Behat (8.3, Chrome Lowest)	5m 30s
Unit (8.1, Phpunit Lowest)	2m 4s
Behat (latest, Firefox)	5m 32s
Unit (8.2, Phpunit)	2m 3s
Behat (latest, Chrome Slow)	9m 45s
Unit (8.2, Phpunit Lowest)	2m 1s
Behat (latest, Firefox Slow)	7m 44s
Unit (8.3, Phpunit)	2m 16s
Unit (8.3, Phpunit Lowest)	1m 58s
Unit (latest, Phpunit Burn)	5m 25s
	1h 24m 40s

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