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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/1161121Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580264}