Chrome Version       : 44fc2421eccfc4c19bd0c212fdcfe4fc8cdf4c08 / p493972 (landed 8/12)
OS Version: OS X 10.12.6


What steps will reproduce the problem?
1. Build net_unittests on mac at the above versions
2. Run "net_unittests --gtest_filter=HostResolverImplDnsTest.LocalhostLookupWithHosts:HostResolverImplDnsTest.DnsTask"

What is the expected result?

Both tests pass.


What happens instead of that?

The second test fails.  Note that if run by itself, it passes. 

Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.49 Safari/537.36

cd ../../; ninja -C out/Default -j 100 net_unittests && out/Default/net_unittests --gtest_filter=HostResolverImplDnsTest.LocalhostLookupWithHosts:HostResolverImplDnsTest.DnsTask
ninja: Entering directory `out/Default'
ninja: no work to do.
IMPORTANT DEBUGGING NOTE: batches of tests are run inside their
own process. For debugging a test inside a debugger, use the
--gtest_filter=<your_test_name> flag along with
--single-process-tests.
Using sharding settings from environment. This is shard 0/1
Using 1 parallel jobs.
Note: Google Test filter = HostResolverImplDnsTest.LocalhostLookupWithHosts:HostResolverImplDnsTest.DnsTask
[==========] Running 2 tests from 1 test case.
[----------] Global test environment set-up.
[----------] 2 tests from HostResolverImplDnsTest
[ RUN      ] HostResolverImplDnsTest.LocalhostLookupWithHosts
[       OK ] HostResolverImplDnsTest.LocalhostLookupWithHosts (1 ms)
[ RUN      ] HostResolverImplDnsTest.DnsTask
../../net/dns/host_resolver_impl_unittest.cc:1751: Failure
Value of: requests_[0]->WaitForResult()
Expected: net::ERR_NAME_NOT_RESOLVED
  Actual: 0, net::OK
[  FAILED  ] HostResolverImplDnsTest.DnsTask (2 ms)
[----------] 2 tests from HostResolverImplDnsTest (3 ms total)

[----------] Global test environment tear-down
[==========] 2 tests from 1 test case ran. (4 ms total)
[  PASSED  ] 1 test.
[  FAILED  ] 1 test, listed below:
[  FAILED  ] HostResolverImplDnsTest.DnsTask

Happy to do more investigation or reproduction on the machine this is happening on if desired.