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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/+/2376806Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Maksim Sisov (GMT+3) <msisov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#801692}