Revert of ui: compositor: setup in-process gpu ipc forwarding on ozone (patchset...

Revert of ui: compositor: setup in-process gpu ipc forwarding on ozone (patchset #3 id:40001 of https://codereview.chromium.org/767273002/)

Reason for revert:
This CL causes DragDropTest.DragDropAcrossMultiDisplay to crash on Ozone
See http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Tests%20%281%29/builds/6907/steps/interactive_ui_tests/logs/DragDropAcrossMultiDisplay

Original issue's description:
> ui: compositor: setup in-process gpu ipc forwarding on ozone
>
> BUG=437864
> TEST=run ash_unittests on ozone/freon image
>
> Committed: https://crrev.com/a12855418a74cf01d26d281231079a6ec5da710d
> Cr-Commit-Position: refs/heads/master@{#306590}

TBR=spang@chromium.org,oshima@chromium.org,lionel.g.landwerlin@intel.com
NOTREECHECKS=true
NOTRY=true
BUG=437864

Review URL: https://codereview.chromium.org/775073003

Cr-Commit-Position: refs/heads/master@{#306611}