message: update names of Metal GPU APIs.
diff: @@ -386,7 +386,7 @@ void ProcessInputWithQuantizedModel(
  - (void)dealloc {
  #if TFLITE_USE_GPU_DELEGATE
  if (delegate) {
  - DeleteGpuDelegate(delegate);
  + TFLGpuDelegateDelete(delegate);
  }
  #endif
  [self teardownAVCapture];
  @@ -415,10 +415,10 @@ void ProcessInputWithQuantizedModel(
  tflite::InterpreterBuilder(*model, resolver)(&interpreter);
  #if TFLITE_USE_GPU_DELEGATE
  - GpuDelegateOptions options;
  + TFLGpuDelegateOptions options;
  options.allow_precision_loss = true;
  - options.wait_type = GpuDelegateOptions::WaitType::kActive;
  - delegate = NewGpuDelegate(&options);
  + options.wait_type = TFLGpuDelegateWaitTypeActive;
  + delegate = TFLGpuDelegateCreate(&options);
  interpreter->ModifyGraphWithDelegate(delegate);
  #endif
  