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We decided to remove the scheduling category.

If we plan to look again on our the scheduler is performing through
slow-reports, we gonna add a specific scenario since this is doubling
the amoung of events.

R=oysteine@chromium.org

Change-Id: Id280597bcb41fd1a0765773c4ed42a97dabd83aa
Reviewed-on: https://chromium-review.googlesource.com/c/1307893Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604683}