This reverts commit ffcbc3b2f5417b09328eae4aeb8de2e5eab6324d.

This test broke sky_tests:

Regressions: Unexpected text-only failures (6)
  framework/flights-app.sky [ Failure ]

Example:

http://build.chromium.org/p/client.mojo/builders/Mojo%20Linux%20ASan%20%28dbg%29/builds/173/steps/Sky%20tests/logs/stdio

TBR=ojan

Review URL: https://codereview.chromium.org/880863002