[Cleanup] Remove no-longer-used SpeculativeConfig.enable_chunked_prefill (#27826)

Signed-off-by: Nick Hill <nhill@redhat.com>

vllm/config/speculative.py

@@ -78,10 +78,6 @@ class SpeculativeConfig:
     draft_tensor_parallel_size: int | None = Field(default=None, ge=1)
     """The degree of the tensor parallelism for the draft model. Can only be 1
     or the same as the target model's tensor parallel size."""
-    disable_logprobs: bool = True
-    """If set to True, token log probabilities are not returned during
-    speculative decoding. If set to False, token log probabilities are returned
-    according to the log probability settings in SamplingParams."""
 
     # Draft model configuration
     quantization: me_quant.QuantizationMethods | None = None
@@ -126,12 +122,6 @@ class SpeculativeConfig:
     """The configuration of the target model."""
     target_parallel_config: SkipValidation[ParallelConfig] = None  # type: ignore
     """The parallel configuration for the target model."""
-    enable_chunked_prefill: SkipValidation[bool] = None  # type: ignore
-    """Whether vLLM is configured to use chunked prefill or not. Used for
-    raising an error since it's not yet compatible with speculative decode."""
-    disable_log_stats: SkipValidation[bool] = None  # type: ignore
-    """Whether to disable the periodic printing of stage times in speculative
-    decoding."""
 
     # params generated in the post-init stage
     draft_model_config: SkipValidation[ModelConfig] = None  # type: ignore