Remove code owners for tf.contrib modules

CODEOWNERS

@@ -13,55 +13,4 @@
 /tensorflow/tensorboard/ @jart
 /tensorflow/tools/docs/ @markdaoust
 
-# contrib
-
-# NEED OWNER: /tensorflow/contrib/all_reduce
-/tensorflow/contrib/autograph/ @mdanatg @kkimdev
-/tensorflow/contrib/batching/ @alextp @chrisolston
-/tensorflow/contrib/bayesflow/ @ebrevdo @rsepassi @jvdillon
-/tensorflow/contrib/boosted_trees/ @sshrdp @yk5 @nataliaponomareva
-/tensorflow/contrib/checkpoint/ @allenlavoie
-/tensorflow/contrib/contrib/cluster_resolver/ @frankchn
-/tensorflow/contrib/cmake/ @mrry
-/tensorflow/contrib/copy_graph/ @tucker @poxvoculi
-/tensorflow/contrib/crf/ @kentonl
-/tensorflow/contrib/data/ @mrry
-/tensorflow/tensorflow/contrib/distribute @joshl @priyag @sourabhbajaj @frankchn
-/tensorflow/contrib/distributions/ @jvdillon @langmore @rsepassi
-/tensorflow/contrib/eager @jaingaurav @alextp
-/tensorflow/contrib/factorization/ @agarwal-ashish @xavigonzalvo
-/tensorflow/contrib/ffmpeg/ @fredbertsch
-/tensorflow/contrib/framework/ @ebrevdo
-/tensorflow/contrib/graph_editor/ @purpledog
-# NEED OWNER: /tensorflow/contrib/grid_rnn/
-/tensorflow/contrib/hadoop @yongtang
-/tensorflow/contrib/hvx/ @satok16
-/tensorflow/contrib/integrate/ @shoyer
-/tensorflow/contrib/kernel_methods/ @petrosmol
-/tensorflow/contrib/ios_examples/ @petewarden
-/tensorflow/contrib/labeled_tensor/ @shoyer
-/tensorflow/contrib/layers/ @fchollet @martinwicke
-/tensorflow/contrib/learn/ @martinwicke @ispirmustafa @alextp
-/tensorflow/contrib/linear_optimizer/ @petrosmol @andreasst @katsiapis
-/tensorflow/contrib/lookup/ @ysuematsu @andreasst
-/tensorflow/contrib/losses/ @alextp @ispirmustafa
-/tensorflow/contrib/makefile/ @petewarden @satok16 @wolffg
-/tensorflow/contrib/metrics/ @alextp @honkentuber @ispirmustafa
-/tensorflow/contrib/opt/ @strategist333 @alextp
-/tensorflow/contrib/pi_examples/ @maciekcc
-/tensorflow/contrib/quantization/ @petewarden
-/tensorflow/contrib/rnn/ @ebrevdo @scottzhu
-/tensorflow/contrib/saved_model/ @nfiedel @sukritiramesh @allenlavoie
-/tensorflow/contrib/seq2seq/ @ebrevdo @lmthang
-/tensorflow/contrib/session_bundle/ @nfiedel @sukritiramesh
-/tensorflow/contrib/slim/ @sguada @thenbasilmanran
-/tensorflow/contrib/stateless/ @girving @alextp
-/tensorflow/contrib/tensor_forest/ @gilberthendry @thomascolthurst @yupbank
-/tensorflow/contrib/tensorrt/ @aaroey @smit-hinsu @azaks2
-# NEED OWNER: /tensorflow/contrib/testing/
-/tensorflow/contrib/timeseries/ @allenlavoie
-/tensorflow/contrib/tpu/ @frankchn @saeta @jhseu @sourabhbajaj
-/tensorflow/contrib/training/ @joel-shor @ebrevdo
-/tensorflow/contrib/util/ @sherrym
-
 /third_party/systemlibs/ @perfinion