Two infra failures from the past day:

https://ci.chromium.org/p/infra/builders/luci.infra.try/Infra%20WCT%20Tester/b8927218063414326240

Monrail tests failed after 28 minutes, looks like tests just hang after running for 15s (no error message).

https://ci.chromium.org/p/infra/builders/luci.infra.try/Infra%20WCT%20Tester/b8927225678051475872

Sheriff-o-Matic tests failed after 27 minutes with: 

  (node:24930) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Page crashed!
  (node:24930) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Need to figure out how to repro these.