Fix build by removing google_type_annotations import.

PiperOrigin-RevId: 281175419

Author: adarob

mesh_tensorflow/bert/bert.py

@@ -21,7 +21,6 @@
 
 from __future__ import absolute_import
 from __future__ import division
-from __future__ import google_type_annotations
 from __future__ import print_function
 
 import collections

mesh_tensorflow/bert/optimization.py

@@ -18,7 +18,6 @@
 
 from __future__ import absolute_import
 from __future__ import division
-from __future__ import google_type_annotations
 from __future__ import print_function
 
 import mesh_tensorflow as mtf

mesh_tensorflow/bert/run_pretraining.py

@@ -18,7 +18,6 @@
 
 from __future__ import absolute_import
 from __future__ import division
-from __future__ import google_type_annotations
 from __future__ import print_function
 
 import os

mesh_tensorflow/bert/tokenization.py

@@ -17,7 +17,6 @@
 
 from __future__ import absolute_import
 from __future__ import division
-from __future__ import google_type_annotations
 from __future__ import print_function
 
 import collections