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Since the surfaceless renderers inherit the surface renderers, we
actually initially post two tasks to render frame. This results in
tearing.

Remove the duplicate post. As a followup, this inheritance should
be removed since it is too error prone.

Bug: 836971
Test: ozone_demo on eve
Change-Id: If79edf65f6aba2cc239f0e349860d6b56ba82450
Reviewed-on: https://chromium-review.googlesource.com/1028844Reviewed-by: Albert Chaulk <achaulk@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553782}