The CQ let https://codereview.chromium.org/2924663003/ land but subsequent commits were failing with the error below.  This is a really easy mistake to make in a patch and it would would be great if the CQ could catch it at the right time.

""" to /b/build/slave/ios-device/build/src/out/Release-iphoneos/args.gn.
/b/build/slave/ios-device/build/src/buildtools/mac/gn gen //out/Release-iphoneos --check
  -> returned 1
ERROR at //ios/chrome/browser/ui/payments/payment_request_mediator_unittest.mm:17:11: Can't include this header from here.
#include "components/signin/core/browser/signin_manager.h"
          ^----------------------------------------------
The target:
  //ios/chrome/browser/ui/payments:unit_tests
is including a file from the target:
  //components/signin/core/browser:browser
It's usually best to depend directly on the destination target.
In some cases, the destination target is considered a subcomponent
of an intermediate target. In this case, the intermediate target
should depend publicly on the destination to forward the ability
to include headers.
Dependency chain (there may also be others):
  //ios/chrome/browser/ui/payments:unit_tests -->
  //ios/chrome/browser/ui/payments:payments --[private]-->
  //components/signin/core/browser:browser

E.g. https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.mac%2Fios-device%2F226891%2F%2B%2Frecipes%2Fsteps%2Fgenerate_build_files__mb___with_patch_%2F0%2Fstdout