message: Remove internal flag.
  The flag was exported un-intentionally due to an internal refactoring.
diff: @@ -28,7 +28,7 @@ limitations under the License.
  #include "tensorflow/core/platform/env.h"
  #include "tensorflow/core/protobuf/worker.pb.h"
  -ABSL_FLAG(bool, grpc_deepcopy_tensor_response, false, "Disables mem sharing");
  +// (Omitted internal-only flag)
  namespace tensorflow {
  namespace grpc {
  @@ -185,9 +185,7 @@ void EncodeTensorToByteBuffer(bool is_dead, const Tensor& val, bool require_ack,
  // We enable this behavior if the tensor is large.
  bool share_tensor_slice_memory = (tdata.size() > kLargeTensorBytes);
  - if (absl::GetFlag(FLAGS_grpc_deepcopy_tensor_response)) {
  - share_tensor_slice_memory = false;
  - }
  + // (Omitted internal-only conditional)
  size_t encoder_size = expected_size - tdata.size();
  