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This reverts commit 2b20bcdd.

Reason for revert: Relanding after reverting https://crrev.com/c/1156998.

Original change's description:
> Revert "Add in-process VizCompositorThread for software compositing."
>
> This reverts commit 7d8b7c2d.
>
> Reason for revert: Need to revert https://crrev.com/c/1156998
>
> Original change's description:
> > Add in-process VizCompositorThread for software compositing.
> >
> > We are having issues where starting a GPU process consistently fails on
> > some systems. Currently OOP-D runs the display compositor in the GPU
> > process always. This includes when both hardware acceleration and
> > SwiftShader are disabled. If we can't start the GPU process, we can't
> > run the display compositor and Chrome crashes.
> >
> > This CL changes where the VizCompositorThread runs if the GPU access is
> > disabled on Windows. We start the thread after giving up on the GPU
> > process and create FrameSinkManagerImpl + dependencies on it.
> >
> > Also fix chrome://gpu page so that OOP-D and surface sync features are
> > still correct if |gpu_access_blocked| is true.
> >
> > There is a lot of peripheral cleanup and code reuse possible as a follow
> > up to this CL. It's not attempted here to make this easier to merge back
> > to M69.
> >
> > Bug: 849639
> > Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
> > Change-Id: Ica6a3ec5b0e7951cb6807b135df4b4cfe410e394
> > Reviewed-on: https://chromium-review.googlesource.com/1158723
> > Reviewed-by: Antoine Labour <piman@chromium.org>
> > Commit-Queue: kylechar <kylechar@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#580241}
>
> TBR=sadrul@chromium.org,kylechar@chromium.org,piman@chromium.org
>
> Change-Id: I00fc978561630ef292436e2d44012a0931551d0f
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 849639
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
> Reviewed-on: https://chromium-review.googlesource.com/1161121
> Reviewed-by: kylechar <kylechar@chromium.org>
> Commit-Queue: kylechar <kylechar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#580264}

TBR=piman@chromium.org

Change-Id: I6beb00a3551800cae159e503e5dcb5be9a45116e
Bug: 849639
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1161122
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580390}