I created a cl which just adds an comment on navigation_url_loader_network_service.cc.
https://chromium-review.googlesource.com/c/chromium/src/+/1049354

The "check_network_annotations" test fails with this error message:
https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux_chromium_rel_ng/87901

Starting traffic annotation auditor. This may take from a few minutes to a few hours based on the scope of the test.
[Errors]
  (1)	'tools/traffic_annotation/summary/annotations.xml' requires update. It is recommended to run traffic_annotation_auditor locally to do the updates automatically (please refer to tools/traffic_annotation/auditor/README.md), but you can also apply the following edit(s) to do it manually:
	Update line: ' <item id="navigation_url_loader" hash_code="63171670" type="0" content_hash_code="129352907" os_list="linux,windows" file_path="content/browser/loader/navigation_url_loader_network_service.cc"/>' --> ' <item id="navigation_url_loader" hash_code="63171670" type="0" content_hash_code="129352907" os_list="linux,windows" file_path="/b/swarming/w/ir/cache/builder/src/out/Release/../../content/browser/loader/navigation_url_loader_network_service.cc"/>'
 If you are using build flags that modify files (like jumbo), rerun the auditor using --all-files switch.