Roll expect_tests to 0.2.8 to fix an issue with MultiTests and flaky coverage
Roll expect_tests to 0.2.8 to fix an issue with MultiTests and flaky coverage

TBR=agable@chromium.org
BUG=

Review URL: https://codereview.chromium.org/477003002

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