The feature was removed from the bots a while ago. It was
superseeded by the flaky-test detection which reruns tests.

Remaining tests still marked as flaky most certainly pass
since a while.

Referencing all the bugs whose expectations lines get
removed by this.

BUG=v8:3838,v8:3525,v8:3125
LOG=n

Review URL: https://codereview.chromium.org/1802983002

Cr-Commit-Position: refs/heads/master@{#34804}