Link to Analysis: https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVy5QELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCKuAWNocm9taXVtLndpbi9XaW43IFRlc3RzIChkYmcpKDEpLzcxNzk2L3dlYmtpdF9sYXlvdXRfdGVzdHMgKGV4cGVyaW1lbnRhbCkvZG1seWRIVmhiQzkxYzJWeUxXRmpkR2wyWVhScGIyNHRkakl2Wm1GemRDOWxkbVZ1ZEhNdmJXbGtaR3hsUTJ4cFkydEJkWFJ2YzJOeWIyeHNMV3hoZEdOb2FXNW5MbWgwYld3PQwLEhNNYXN0ZXJGbGFrZUFuYWx5c2lzGAEM

See https://bugs.chromium.org/p/chromium/issues/detail?id=889280#c2 for the explanation of why we think FindIt blamed the CL incorrectly.  It seems particularly weird that the CL got flagged for taking the test from always failing to flakily passing - seems there should be at least a warning for sheriffs that reverting the CL may not actually be desirable in that case.