Purely Google refactor

PiperOrigin-RevId: 320687148

Author: hsudhof

tensor2tensor/data_generators/all_problems.py

@@ -81,7 +81,6 @@
     "tensor2tensor.data_generators.subject_verb_agreement",
     "tensor2tensor.data_generators.timeseries",
     "tensor2tensor.data_generators.transduction_problems",
-    "tensor2tensor.data_generators.translate_encs_cubbitt",
     "tensor2tensor.data_generators.translate_encs",
     "tensor2tensor.data_generators.translate_ende",
     "tensor2tensor.data_generators.translate_enes",