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This reverts commit 7faa3b0c.

Reason for revert: This appears to cause Chrome crashes in the
desktopui_MashLogin Autotest, resulting in failures in the
informational Chrome PFQ builders: https://crbug.com/804052

Original change's description:
> [ozone/drm]: support content and service manager launching
> 
> The existing in-progress implementation of ozone/drm over mojo IPC
> assumed that the ozone host would use a mojo ServiceManager provided
> at initialization that it could use to launch and connect to the DRM
> and cursor services. However, when used in a src/content context (such
> as would be the case in Chrome), there is no service manager available
> at ozone initialization time. Instead, content::GpuProcessHost
> notifies the ozone host later from the browser I/O thread when the GPU
> process containing the DRM and cursor services is running.
> 
> This CL refactors the ozone/drm/mojo implementation to isolate the
> acquisition of mojo pipes into a separate class that supports both
> styles of pipe acquistion: either by the use of a ServiceManager or
> via an asynchronously injected dependency on content.
> 
> This CL also restructures the launch of the DRM thread itself so that
> it can be deferred until after the GPU sandbox is initialized in a way
> that does not depend on the use of legacy IPC message filters.
> 
> BUG=620927
> 
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: Icfb2261326cd1d5d6e2769d9801c02a744e1102a
> Reviewed-on: https://chromium-review.googlesource.com/861749
> Commit-Queue: Robert Kroeger <rjkroege@chromium.org>
> Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
> Reviewed-by: Yuzhu Shen <yzshen@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#530562}

TBR=rjkroege@chromium.org,yzshen@chromium.org,dnicoara@chromium.org,piman@chromium.org

Change-Id: Ieb533a2c3db1634953437fcd4c34200f38e51601
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 620927
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/876936Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530712}