message: Remove unused namespace alias.
diff: @@ -28,8 +28,6 @@ limitations under the License.
  #include "tensorflow/core/lib/strings/strcat.h"
  #include "tensorflow/core/platform/logging.h"
  -namespace se = ::perftools::gputools;
  -
  namespace xla {
  StatusOr<GlobalDataHandle> AllocationTracker::Register(
  