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This service is run in the GPU process and its interfaces are bound only
by the browser, brokering unfiltered requests from renderers. Logic is
simplified by removing all dependencies on Service Manager APIs, in
favor of the browser's brokering logic talking directly to
GpuProcessHost and maintaining a persistent connection to the service.

Bug: 977637
Change-Id: I9047889de659b8ff61df4bae40867d3b81d8127f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1761689
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688616}