message: Remove references to contrib
  Summary: Contrib has been removed.
  Test Plan: all tests ok (on merge branch)
  Reviewers: #tensorflow, georgep
diff: @@ -459,7 +459,6 @@ py_library(
  ":ipu_lib",
  "//tensorflow:tensorflow_py",
  "//tensorflow/compiler/plugin/poplar:test_utils_py",
  - "//tensorflow/contrib/compiler:xla",
  "//tensorflow/python:array_ops",
  "//tensorflow/python:framework",
  "//tensorflow/python:platform",
  @@ -478,7 +477,6 @@ tf_py_test(
  ":pipelining_test_util",
  "//tensorflow:tensorflow_py",
  "//tensorflow/compiler/plugin/poplar:test_utils_py",
  - "//tensorflow/contrib/compiler:xla",
  "//tensorflow/python:array_ops",
  "//tensorflow/python:framework",
  "//tensorflow/python:platform",
  