Revert "fix: apply_prompt_template"

This reverts commit 3e0e40b.

Author: ishaan-jaff

litellm/llms/watsonx/chat/transformation.py

@@ -120,48 +120,3 @@ def _prepare_payload(self, model: str, api_params: WatsonXAPIParams) -> dict:
             None if model.startswith("deployment/") else api_params["project_id"]
         )
         return payload
-    
-    @staticmethod
-    def apply_prompt_template(model: str, messages: List[Dict[str, str]]) -> dict:
-        """
-        Apply prompt template to messages for WatsonX Provider
-        """
-        if "granite" in model and "chat" in model:
-            # granite-13b-chat-v1 and granite-13b-chat-v2 use a specific prompt template
-            return ibm_granite_pt(messages=messages)
-        elif "ibm-mistral" in model and "instruct" in model:
-            # models like ibm-mistral/mixtral-8x7b-instruct-v01-q use the mistral instruct prompt template
-            return mistral_instruct_pt(messages=messages)
-        elif "openai/gpt-oss" in model:
-            # gpt-oss models (e.g., openai/gpt-oss-120b) use HuggingFace chat templates
-            # These models have chat templates in separate .jinja files, not in tokenizer_config.json
-            # Extract the model name for HuggingFace lookup
-            hf_model = model.split("watsonx/")[-1] if "watsonx/" in model else model
-            try:
-                return hf_chat_template(model=hf_model, messages=messages)
-            except Exception:
-                # If HF template fetch fails, fall back to trying the generic handler below
-                pass
-        elif "meta-llama/llama-3" in model and "instruct" in model:
-            # https://llama.meta.com/docs/model-cards-and-prompt-formats/meta-llama-3/
-            return custom_prompt(
-                role_dict={
-                    "system": {
-                        "pre_message": "<|start_header_id|>system<|end_header_id|>\n",
-                        "post_message": "<|eot_id|>",
-                    },
-                    "user": {
-                        "pre_message": "<|start_header_id|>user<|end_header_id|>\n",
-                        "post_message": "<|eot_id|>",
-                    },
-                    "assistant": {
-                        "pre_message": "<|start_header_id|>assistant<|end_header_id|>\n",
-                        "post_message": "<|eot_id|>",
-                    },
-                },
-                messages=messages,
-                initial_prompt_value="<|begin_of_text|>",
-                final_prompt_value="<|start_header_id|>assistant<|end_header_id|>\n",
-            )
-        else:
-            return messages