Add a script to update the expected errors for

net/data/verify_certificate_chain_unittest/common.py

Index: net/data/verify_certificate_chain_unittest/common.py
diff --git a/net/data/verify_certificate_chain_unittest/common.py b/net/data/verify_certificate_chain_unittest/common.py
index 37d4d5b0bf153a689d158b675ee6a84b23c33cbe..c5bcd9729986c1011f2062033565531500e24809 100755
--- a/net/data/verify_certificate_chain_unittest/common.py
+++ b/net/data/verify_certificate_chain_unittest/common.py
@@ -453,9 +453,8 @@ def write_test_file(description, chain, trust_anchor, utc_time, verify_result,
   verify_result_string = 'SUCCESS' if verify_result else 'FAIL'
   test_data += '\n' + text_data_to_pem('VERIFY_RESULT', verify_result_string)
 
-  # TODO(eroman): Make the consumer pass errors as a string.
   if errors is not None:
-    test_data += '\n' + text_data_to_pem('ERRORS', '\n'.join(errors))
+    test_data += '\n' + text_data_to_pem('ERRORS', errors)
 
   write_string_to_file(test_data, out_pem if out_pem else g_out_pem)