Revert "Bug 981009 - Check that we have as many timings as we have runs for startup_test."

This reverts commit 93bdeec8365009434f694672d6db8f0eb25650c0.
Merge pull request #21724 from hfiguiere/master

Revert "Bug 981009 - Check that we have as many timings as we have runs for startup_test." r=me