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The removes Service Manager dependencies from the Mirroring Service and
its singular client in Chrome.  CastMirroringServiceHost now manages its
own service process instead of using Service Manager.

This service was also the only service asking to bind the viz.mojom.Gpu
interface through a Connector to the browser (supported by
common_browser_interfaces.cc), so that support code has been removed and
CastMirroringServiceHost instead pushes a Gpu interface to the service,
acquired directly from content::CreateGpuClient(). This should be
functionally equivalent to what was done before but with fewer round-
trips.

Bug: 977637
Change-Id: I2ac8addac4a4e67c8ad35856ec70052530990dcf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1743313
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686669}