Roll expect_tests to 0.2.5.
Roll expect_tests to 0.2.5.

R=agable@chromium.org, eseidel@chromium.org
BUG=402067

Review URL: https://codereview.chromium.org/469443002

nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra,nicko96/Chrome-Infra