Rolled expect_tests to 0.3.13
Rolled expect_tests to 0.3.13

BUG=506398

Review URL: https://codereview.chromium.org/1216933016

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