message: Remove stddef.h from model_builder.
diff: @@ -15,8 +15,6 @@ limitations under the License.
  #include "tensorflow/lite/delegates/gpu/common/model_builder.h"
  -#include <stddef.h>
  -
  #include <algorithm>
  #include <cstdint>
  #include <cstring>
  @@ -582,7 +580,7 @@ absl::Status MaybeFuseActivation(TfLiteFusedActivation fused_activation,
  if (fused_activation == kTfLiteActNone) {
  return absl::OkStatus();
  }
  - const auto& outputs = graph->FindOutputs(node->id);
  + const auto outputs = graph->FindOutputs(node->id);
  if (outputs.empty()) {
  return absl::InternalError("Empty outputs in fused node");
  }
  