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This migrates Utility processes to direct ChildProcess API usage instead
of bootstrapping IPC through the Service Manager.

As this is the last remaining use of Service Manager IPC to bootstrap
Content child processes, this also rips out a bunch of infrastructure
that existed only to support that.

Bug: 977637
Change-Id: I08e542f1d9f294bc1c387ea5845e8ba0d5a7d2b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919719
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#718352}