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This reverts commit bdc39552.

Reason for revert: breaks graphics on some Chrome OS devices.

Original change's description:
> Move GPU and Plugin processes off Service Manager
>
> This introduces a new mode for Browser/ChildProcessHost where the
> primordial pipe is a simple content.mojom.ChildProcess pipe. This will
> become the new default mode of operation for child processes, and
> eventually will be the only mode of operation once NaCl processes are
> gone.
>
> GPU and plugin processes are ported to this mode here since both
> require only minimal changes. This means that "content_gpu" and
> "content_plugin" services no longer exist.
>
> Bug: 977637
> Change-Id: I39c5d2284bd84246663d5f0eb4cbab3b3483d798
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918326
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Commit-Queue: Ken Rockot <rockot@google.com>
> Cr-Commit-Position: refs/heads/master@{#717857}

NOPRESUBMIT=true

Bug: 1028852
Bug: 977637
Tbr: rockot@google.com
Tbr: avi@chromium.org
Tbr: rsesek@chromium.org
Change-Id: I21259f3cf7718ad940cafba4a56d9349412d3b74
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948664
Commit-Queue: Shuhei Takahashi <nya@chromium.org>
Reviewed-by: Shuhei Takahashi <nya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720940}