message: Fix for adhering to latest clang style guide.
diff: @@ -16,6 +16,7 @@ limitations under the License.
  #define TENSORFLOW_CORE_FRAMEWORK_SHAPE_INFERENCE_TESTUTIL_H_
  #include <vector>
  +
  #include "tensorflow/core/framework/node_def.pb.h"
  #include "tensorflow/core/framework/shape_inference.h"
  #include "tensorflow/core/lib/core/status.h"
  @@ -90,7 +91,7 @@ class ShapeInferenceTestutil {
  ::tensorflow::shape_inference::ShapeInferenceTestutil::InferShapes( \
  op, i, "e") \
  .error_message(); \
  - const std::string& substring = error_substring; \
  + const std::string substring = error_substring; \
  EXPECT_NE("", error_message); \
  EXPECT_TRUE(absl::StrContains(error_message, substring)) \
  << "Expected to see '" << substring << "' in '" << error_message \
  