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This reverts commit d332af51.

Fixed crash due to missing member var initialization.

TEST=ran failing gl_unittests locally

Original change's description:
> Revert "gpu: Sync to primary monitor's vblank (windows)"
>
> This reverts commit bd0cae50.
>
> Reason for revert: Cause failures in DirectCompositionSurfaceTest.*
> Builder: https://ci.chromium.org/p/chromium/builders/ci/Win10%20Debug%20%28NVIDIA%29?limit=200
> First build: https://ci.chromium.org/p/chromium/builders/ci/Win10%20Debug%20%28NVIDIA%29/22377?blamelist=1#overview-tab
>
> Crash example:
> ...snip...
>
> Original change's description:
> > gpu: Sync to primary monitor's vblank (windows)
> >
> > DWM composition is limited to primary monitor's refresh rate.  Prior to
> > GPU vsync we would use DWM composition rate to drive begin frames.
> >
> > With GPU vsync we started using per monitor vblank to limit begin frames
> > in case primary monitor had higher refresh rate, but this might be
> > causing draw duration and omnibar latency regressions.  MS platform team
> > also suggested syncing to primary monitor only.  In any case the correct
> > approach would be to further limit begin frames based on event queries
> > from 2 frames back.
> >
> > This CL makes the GPU vsync begin frames sync to primary monitor, and
> > also makes the vsync thread a singleton since it doesn't have per-window
> > state any more.
> >
> > Bug: 953970
> > Change-Id: Id3d3f043cb847172b1d6ba4bd38b087ceb2d8631
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1711215
> > Reviewed-by: Zhenyao Mo <zmo@chromium.org>
> > Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#679832}
>
> TBR=zmo@chromium.org,sunnyps@chromium.org
>
> Change-Id: If4a762325952dd33283bf41a13321e759de51025
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 953970
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1713510
> Reviewed-by: Maxim Kolosovskiy <kolos@chromium.org>
> Commit-Queue: Maxim Kolosovskiy <kolos@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#679915}

TBR=zmo@chromium.org,sunnyps@chromium.org,kolos@chromium.org

Change-Id: I743026c218932916aba9d9c7722d8343e9fdbdd9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 953970
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716211
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680276}