Some tests failed after turning this flag to be true. e.g.

Version/QuicNetworkTransactionTest.TimeoutAfterHandshakeConfirmed/0 

https://logs.chromium.org/v/?s=chromium%2Fbb%2Ftryserver.chromium.mac%2Fmac_chromium_rel_ng%2F609213%2F%2B%2Frecipes%2Fsteps%2Fnet_unittests__with_patch_%2F0%2Fstdout

reproducable by flipping the flag and running tests locally:  ./out/Default/net_unittests --test-launcher-bot-mode --test-launcher-batch-limit=100 --gtest_filter=*TimeoutAfterHandshakeConfirmed*