Probably due to crrev.com/69d145fc528e58dd6eb73bd937f3c044724dd993.

This occurred during a gyp build.

gen/policy/policy/policy_constants.cc:937:5: error: 'kAllowScreenLock' is not a member of 'policy::key'
   { key::kAllowScreenLock,                                  1 },
     ^
gen/policy/policy/policy_constants.cc:1086:5: error: 'kLoginVideoCaptureAllowedUrls' is not a member of 'policy::key'
   { key::kLoginVideoCaptureAllowedUrls,                     3 },
     ^
gen/policy/policy/cloud_policy_generated.cc: In function 'void policy::DecodePolicy(const enterprise_management::CloudPolicySettings&, base::WeakPtr<policy::CloudExternalDataManager>, policy::PolicyMap*)':
gen/policy/policy/cloud_policy_generated.cc:6516:20: error: 'kAllowScreenLock' is not a member of 'policy::key'
           map->Set(key::kAllowScreenLock, 

sahel@ was seeing other issues with kAllowScreenLock on Mac:
FAILED: obj/components/policy/policy/policy_constants.o

....

gen/policy/policy_constants.cc:930:12: error: unused variable 'kAllowScreenLock' [-Werror,-Wunused-const-variable]

const char kAllowScreenLock[] = "AllowScreenLock";