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This also removes the stale 'DirectCompositionGpuVSync' experiment from
testing config since a size presubmit was failing. This was the only
stale experiment found in the json file (found using cleanup.py from
crbug.com/1053702).

Bug: 1042877
Change-Id: I632e19f837c7566849cc3d4477732084765ffa12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399133
Commit-Queue: Carlos IL <carlosil@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Auto-Submit: Carlos IL <carlosil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805546}