Url to the Failure:
https://findit-for-me.appspot.com/waterfall/check-flake?master_name=chromium.memory&builder_name=Mac%20ASan%2064%20Tests%20(1)&build_number=23029&step_name=browser_tests%20on%20Mac-10.9&test_name=ContinueWhereILeftOffTest.PRE_PRE_LocalStorageClearedOnExit

What is the bug or feature:

In cases where the flaky tests is a PRE_ tests, we should strip the prefix and run the tasks on the main test.