Remove chromeos/printing/ from whitelist of old callback API users

This has been refactored as of
crrev.com/daa569a1

Bug: 968109, 714018
Change-Id: I19ae08bb1e4a9df3f541c3456b4c32e9d494be39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1710643Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Vladislav Kuzkokov <vkuzkokov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679943}

PRESUBMIT.py

@@ -288,7 +288,6 @@ _NOT_CONVERTED_TO_MODERN_BIND_AND_CALLBACK = '|'.join((
   '^chromeos/geolocation/',
   '^chromeos/login/',
   '^chromeos/network/',
-  '^chromeos/printing/',
   '^chromeos/process_proxy/',
   '^chromeos/services/',
   '^chromeos/settings/',