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This reverts commit 8ce938a2.

Reason for revert: <Suspect this CL breaks Linux FYI Ozone bot and  Linux FYI SkiaRenderer Vulkan (NVIDIA)/(Intel HD 630) >

Original change's description:
> Reland "Reland "X11 and Ozone: enable use_x11 and use_ozone""
> 
> This is a reland of 75363679
> 
> Original change's description:
> > Reland "X11 and Ozone: enable use_x11 and use_ozone"
> > 
> > This is a reland of f985905e.
> > 
> > This change broke our headless build:
> > ERROR at //ui/events/platform/x11/BUILD.gn:51:5: Assertion failed.
> >     assert(ozone_platform_x11)
> >     ^-----
> > See //components/viz/demo/BUILD.gn:73:7: which caused the file to be included.
> >       "//ui/events/platform/x11",.
> > 
> > Fix:
> > Don't include x11 build for headless case.
> > 
> > Original change's description:
> > > X11 and Ozone: enable use_x11 and use_ozone
> > >
> > > This is the final change that enables use_x11
> > > and use_ozone for Linux builds and (as it was
> > > before) excludes X11 for chromeos, chromecast,
> > > lacros.
> > >
> > > in order to run ozone/X11/wayland, one must pass
> > > —enable-features=UseOzonePlatform
> > > —ozone-platform=x11 or wayland. otherwise,
> > > non-ozone/X11 is used.
> > >
> > > it’s also possible to completely disable X11
> > > so that clients, who need that kind of build can
> > > continue to have that.
> > >
> > > Bug: 1085700
> > > Change-Id: I171bcb53c406555a1d4bec3e88d76dc676310d48
> > > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2315869
> > > Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> > > Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> > > Reviewed-by: Scott Violet <sky@chromium.org>
> > > Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
> > > Cr-Commit-Position: refs/heads/master@{#801523}
> > 
> > Bug: 1085700
> > Change-Id: I8bf0abead6c94c95ddc58443de7cf2268c977cf1
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376806
> > Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> > Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
> > Cr-Commit-Position: refs/heads/master@{#801692}
> 
> Bug: 1085700
> Change-Id: Ia5ed2af9376354d3378d8edd98a7a1446f13c88b
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379190
> Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
> Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#802773}

TBR=rjkroege@chromium.org,sky@chromium.org,thomasanderson@chromium.org,msisov@igalia.com

Change-Id: I093bf5be51d6858d895c59d6bb31f3aa61c162b9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1085700
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2383110Reviewed-by: Maggie Chen <magchen@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802855}