Disable newly introduced flaky IOThreadTestWithIOThreadObject tests.
Disable newly introduced flaky IOThreadTestWithIOThreadObject tests.

BUG=570703
TBR=aberent@chromium.org

Review URL: https://codereview.chromium.org/1555693002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#367169}

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