message: CLN: use str_util::Join
diff: @@ -24,6 +24,7 @@ limitations under the License.
  #include "tensorflow/core/framework/types.h"
  #include "tensorflow/core/kernels/bounds_check.h"
  #include "tensorflow/core/lib/gtl/array_slice.h"
  +#include "tensorflow/core/lib/strings/str_util.h"
  #include "tensorflow/core/lib/strings/strcat.h"
  #include "tensorflow/core/lib/strings/stringprintf.h"
  #include "tensorflow/core/platform/logging.h"
  @@ -266,9 +267,7 @@ Status RestoreTensorsV2(OpKernelContext* context, const Tensor& prefix,
  }
  }
  if (!mismatched_errors.empty()) {
  - string error_msg = std::accumulate(mismatched_errors.begin(),
  - mismatched_errors.end(),
  - string());
  + const string error_msg = str_util::Join(mismatched_errors, "\n");
  return errors::InvalidArgument(error_msg);
  }
  