Purge unused ModelTester code (#37085)

* Purge correctly this time

* Remove more methods from recent PRs

* make fixup

tests/models/roformer/test_modeling_roformer.py

@@ -200,24 +200,6 @@ class RoFormerModelTester:
         result = model(input_ids, attention_mask=input_mask, token_type_ids=token_type_ids)
         self.parent.assertEqual(result.last_hidden_state.shape, (self.batch_size, self.seq_length, self.hidden_size))
 
-    def create_and_check_for_causal_lm(
-        self,
-        config,
-        input_ids,
-        token_type_ids,
-        input_mask,
-        sequence_labels,
-        token_labels,
-        choice_labels,
-        encoder_hidden_states,
-        encoder_attention_mask,
-    ):
-        model = RoFormerForCausalLM(config=config)
-        model.to(torch_device)
-        model.eval()
-        result = model(input_ids, attention_mask=input_mask, token_type_ids=token_type_ids, labels=token_labels)
-        self.parent.assertEqual(result.logits.shape, (self.batch_size, self.seq_length, self.vocab_size))
-
     def create_and_check_for_generate_causal_lm(
         self,
         config,